Assuming you start with 10.0 g of zinc and 10.0 g hydrochloric acid, identify the limiting reagent and determine what mass of the other will remain after the reaction runs to completion.

QUESTION POSTED AT 12/02/2020 - 04:39 PM

Answered by admin AT 12/02/2020 - 04:39 PM

The balanced chemical reaction for the substances given would be as follows:

Zn + 2HCl = ZnCl2 + H2

We are given the amounts of the reactants used in the reaction. We use these amounts to determine which is the limiting and excess reactant. We do as follows:

10 g Zn (1 mol / 65.38 g) = 0.1530 mol
10 g HCl (1 mol / 36.46 g) =  0.2743 mol

From the the stoichiometric ratio which is 1 is to 2, the limiting reactant would be hydrochloric acid and the excess would be zinc metal.

Mass of zinc that remains = 0.1530 - (0.2743 / 2) = 0.0159 g Zn 
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ANSWERED AT 28/02/2020 - 07:34 PM

QUESTION POSTED AT 28/02/2020 - 07:34 PM

Question 1 what happens during a neutralization reaction?

A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water. The neutralization of a strong acid and strong base has a pH equal to 7.

  • New substances called SALTS and water are formed in neutralization reactions.
  • For example, hydrochloric acid and sodium hydroxide solution react together to form water and sodium chloride solution. The H+ ions and OH– ions produce the water, and the Na+ ions and Cl– ions produce the sodium chloride, NaCl(aq).

ANSWERED AT 28/02/2020 - 05:11 PM

QUESTION POSTED AT 28/02/2020 - 05:11 PM

Every chemical reaction involves a change in

A chemical reaction is when you cant change something back to the way it was before 

ANSWERED AT 28/02/2020 - 05:09 PM

QUESTION POSTED AT 28/02/2020 - 05:09 PM

Can a weak acid be titrated with a weak base

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No indicator is suitable when titrating weak acid with weak alkali

up vote
down vote
This was a statement in my book:

A solution of a weak acid cannot be titrated with a weak base using an indicator to find the end-point because the pH change is too gradual close to the equivalence point.

Could someone please elaborate the bold text.

acid-base ph titration
shareimprove this question
asked May 31 '14 at 13:16

Check this link and search for the section "Titration curves for weak acid v weak base". Be sure to click on the "indicator" link in the section's note, too. Does that help? – Nicolau Saker Neto May 31 '14 at 13:30

if there is a weak base and a weak acid, there will be at least two pKs, complicating the titration curve. The full pH range may be unobtainable by adding a weak base. – DavePhD May 31 '14 at 13:45
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1 Answer
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An indicator works when the solution's pH is in its range. It's not necessarily the equivalence point. The point is called the end point where it actually changes color.

If the difference in volume is small between the equivalence and end points, then the indicator can be used. Since a gradual change implies more volume must be added to obtain the same pH change in other acid base titration, the difference between equivalence point and end point(if you use indicator) will be more and therefore indicator will not be suitable for it.

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edited Jul 31 '14 at 13:45

answered May 31 '14 at 16:58

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ANSWERED AT 28/02/2020 - 05:07 PM

QUESTION POSTED AT 28/02/2020 - 05:07 PM

Amino acids cannot be broken down to provide energy.

False, Dietary proteins are first broken down to individual amino acids by various enzymes and hydrochloric acid present in the gastro-intestinal tract. These amino acids are further broken down to α-keto acids which can be recycled in the body for generation of energy, and production of glucose or fat or other amino acids.

ANSWERED AT 28/02/2020 - 04:42 PM

QUESTION POSTED AT 28/02/2020 - 04:42 PM

Acid mine drainage is formed when water flows past exposed rocks that leach out ______________________ that react with water and oxygen to form

Acid mine drainage is formed when water flows past exposed rocks that leaches out sulfates that react with water and oxygen to form. Sulfate is the answer which means that a salt or it is sulfuric acid. This polyatomic anion is part of our everyday life.

ANSWERED AT 28/02/2020 - 04:42 PM

QUESTION POSTED AT 28/02/2020 - 04:42 PM

What is the molarity of a solution of kno3 (molecular mass = 101 that contains 404 grams of kno3 in 2.00 liters of solution? a 1.00 b 2.00 c 0.500 d 4.00?

(1 mol KNO3/ 101 g KNO3)(404 g KNO3)= 4 moles

ANSWERED AT 28/02/2020 - 04:37 PM

QUESTION POSTED AT 28/02/2020 - 04:37 PM

A certain vinegar is 6.02% acetic acid (hc2h3o2, by mass. how many grams of acetic acid are contained in a 355 ml bottle of vinegar. assume a density of 1.01 g/ml.

First, determine the amount of vinegar in grams by multiplying the volume by the density. That is,
                                        mass = (355 ml) x (1.01 g/mL) = 358.55 g
Then, multiply the calculated mass above by the decimal equivalent of the given percentage above. 
                      amount of acetic acid = (358.55 g)(0.0602) = 21.58 g

ANSWERED AT 28/02/2020 - 04:11 PM

QUESTION POSTED AT 28/02/2020 - 04:11 PM

What happens to the temperature of water between the time ice melts and water boils (this is partially quoted from a question)? Also, what change occurs in temperature after water starts boiling (this is also from a booklet)? Thank you and please explain your thoughts. This is based on the phase changes of water, and you should refer to a graph on the phase changes of water.

Your first statement is very ambiguous so I will give it the best shot as to what you are saying.
The temperature, between the point of ice melting and water boiling, is increasing as water is in its liquid state.
Now during a phase change, or while the water is boiling, the temperature remains constant because the energy being added is being consumed to complete the phase change.
But if you're looking at the phase change graph, the points of positive slopes, are moments when energy is increasing as the water, in whatever state, is increasing. But when the slope of the graph is 0, the water is changing phases and the temperature remains constant! I hope I explained that so you could understand it, and I hope this helps you!

ANSWERED AT 28/02/2020 - 03:47 PM

QUESTION POSTED AT 28/02/2020 - 03:47 PM

Determining missing genotypes

What are the genotypes

ANSWERED AT 28/02/2020 - 03:42 PM

QUESTION POSTED AT 28/02/2020 - 03:42 PM

Write the symbol for every chemical element that has atomic number less than 74 and atomic mass greater than 173.8u

You should be able to locate them on the periodic table as long as you know which part the atomic number is and which part the atomic mass is.

ANSWERED AT 28/02/2020 - 03:22 PM

QUESTION POSTED AT 28/02/2020 - 03:22 PM

Describe four ways you could increase the rate of a chemical reaction.

1. Increase the temperature  

2. Increase the pressure of an reacting gas  

3. Solid reactants are broken into smaller pieces

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ANSWERED AT 28/02/2020 - 03:06 PM

QUESTION POSTED AT 28/02/2020 - 03:06 PM

During a chemical reaction, energy is converted from one form to another increases decreases is used up as bonds are broken and formed

Is used up as bonds are broken and formed .

ANSWERED AT 28/02/2020 - 03:02 PM

QUESTION POSTED AT 28/02/2020 - 03:02 PM

Arrange the following foods in order of increasing acidity : beets. PH=5.9;Camembert cheese,PH=7.4;egg white,pH=8.0;sauerkraut,PH=3.5;yogurt,PH=4.5

Egg white, Camembert cheese, beets, yogurt, sauerkraut

ANSWERED AT 28/02/2020 - 02:47 PM

QUESTION POSTED AT 28/02/2020 - 02:47 PM

What type of reaction is radioactive decay? 1zero order 2first order 3second order 4third order

2. first order reaction
Hope I helped! :)

ANSWERED AT 28/02/2020 - 02:46 PM

QUESTION POSTED AT 28/02/2020 - 02:46 PM

Suppose 13.00 mL of 0.100 M barium hydroxide is required to neutralize 17.00 ml of nitric acid with an unknown concentration. What is the concentration of the nitric acid. Express your answer in mol/L

The concentration of {\text{Ba}}{\left( {{\text{OH}}} \right)_2}solution is \boxed{{\text{0}}{\text{.076 M}}}

Further Explanation:

The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:

1. Molarity (M)

2. Molality (m)

3. Mole fraction (X)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M and its unit is mol/L.

The molarity equation is given by the following expression:

{{\text{M}}_{\text{1}}}{{\text{V}}_{\text{1}}} = {{\text{M}}_{\text{2}}}{{\text{V}}_{\text{2}}}


{{\text{M}}_{\text{1}}} is the molarity of the first solution.

{{\text{V}}_{\text{1}}} is the volume of the first solution.

{{\text{M}}_{\text{2}}} is the molarity of the second solution.

{{\text{V}}_{_{\text{2}}}} is the volume of the second solution.

In the concerned question, {\text{Ba}}{\left( {{\text{OH}}} \right)_2}is neutralized by {\text{HN}}{{\text{O}}_{\text{3}}}. So molarity equation becomes,

{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} = {{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}                           …… (1)


{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is the molarity of {\text{Ba}}{\left( {{\text{OH}}} \right)_2} solution.

{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}is the volume of {\text{Ba}}{\left( {{\text{OH}}} \right)_2}solution.

{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is the molarity of {\text{HN}}{{\text{O}}_{\text{3}}}solution.

{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is the volume of {\text{HN}}{{\text{O}}_{\text{3}}}solution.

Rearrange equation (1) to calculate {{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}.

{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} = \frac{{{{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}{{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}}}}{{{{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}}}                                       …… (2)

The value of {{\text{V}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is 13 mL.

The value of {{\text{M}}_{{\text{Ba}}{{\left( {{\text{OH}}} \right)}_2}}} is 0.100 M.

The value of {{\text{V}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}} is 17 mL.

Substitute these values in equation (2).

\begin{aligned}{{\text{M}}_{{\text{HN}}{{\text{O}}_{\text{3}}}}}&=\frac{{\left( {{\text{0}}{\text{.100 M}}} \right)\left( {{\text{13 mL}}} \right)}}{{\left( {{\text{17 mL}}}\right)}}\\&=0.{\text{07647 M}}\\&\approx {\text{0}}{\text{.076 M}}\\\end{aligned}

Hence the concentration of barium hydroxide solution is 0.076 M.

Learn more:

1. What is the mass of 1 mole of viruses:

2. Determine the moles of water produced:

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: molarity, 13 mL, 17 mL, 0.076 M, Ba(OH)2, M1, V1, M2, V2, HNO3, 0.100 M, molarity, volume.

ANSWERED AT 28/02/2020 - 02:39 PM

QUESTION POSTED AT 28/02/2020 - 02:39 PM

When you do a displacement reaction with iron and copper what is the orange metal called

It is called rust and it forms when water soaks into the metal forming a chemical reaction.

ANSWERED AT 28/02/2020 - 02:21 PM

QUESTION POSTED AT 28/02/2020 - 02:21 PM

What happens during a neutralization reaction?

Protons and hydroxide combined to create water molecules while the remaining ions.

ANSWERED AT 28/02/2020 - 02:17 PM

QUESTION POSTED AT 28/02/2020 - 02:17 PM

How many electrons are needed to completely fill the second level energy? The third? The fourth?

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ANSWERED AT 28/02/2020 - 02:04 PM

QUESTION POSTED AT 28/02/2020 - 02:04 PM

A buffer is 0.282 m c6h5cooh(aq and 0.282 m na(c6h5coo(aq. calculate the ph after the addition of 0.150 moles of nitric acid to 1.0 l of the buffer. the pka of c6h5cooh is 4.20.

You have to use the Henderson-Hasselbalch equation. Keep in mind that because the Pka is given the equation changes form slightly:

PH = Pka + log[acid/base]

Step 1 (Figure out the concentrations):

0.282 M of Acid (C6H5OOH) - 0.150 M = 0.132 M of acid
0.282 M of Base (C6HCOO) + 0.150 M = 0.432 M of bas3

Step 2 (Plug into equation):

PH = Pka + log[acid/base]
PH = 4.20 + log[0.132 M/0.432 M]

PH = 3.69

ANSWERED AT 28/02/2020 - 01:39 PM

QUESTION POSTED AT 28/02/2020 - 01:39 PM

The molar mass of water (H2O) is 18.0 g/mol. A sample of water has a mass of 18.0 g. How many moles of water are contained in this sample? a) 1.00 b) 18.0 c) 36.0 d) 324

Number of moles = Given Mass / Molar mass

Here, Given mass = 18 g
Molar mass = 18 g/mol

Substitute their values, 
n = 18/18
n = 1 mol

In short, Your Answer would be: Option A

Hope this helps!

ANSWERED AT 28/02/2020 - 12:46 PM

QUESTION POSTED AT 28/02/2020 - 12:46 PM

Where in the body are nitrogen compounds found? a.proteins b.nucleic acids like DNA c.fats d.both a & b

I believe the answer is D. both a and b

ANSWERED AT 28/02/2020 - 12:31 PM

QUESTION POSTED AT 28/02/2020 - 12:31 PM