Chemistry

Just some homework. Would like to know if I am right, thanks.

1. Adding salt of a weak acid to a solution of the weak acid:
a)lowers the concentration of the nonionized acid and the concentration of the H30+
b)lowers the concentration of the nonionized acid and raises the concentration of the H30+
c)raises the concentration of the nonionized acid and the concentration of the H30+
d)raises the concentration of the nonionized acid and lowers the concentration of the H30+

I chose c.

2. Salts of a weak acid and stong base produce solutions that are:
acidic, basic, neautral, or all 3?

I said all 3.

3. If an acid is added to a solution of a weak base and it's salt,
a)more water is formed and more weak base ionizes
b) hydronium-ion concentration decreases
c) more hydroxide ion is formed
d) more nonionized weak base is formed

b?

4. Label 2 conjugate acid-base pairs as acid 1, acid 2, base 1 and base 2:

a) CO3 + H3O->HCO3 + H2O


b)HPO4+H2O->OH+H2PO4

I'm not really sure how to do this at all, I just know that the ones begiining with "h" are acids..

Part 2: Which reaction in part a) is hydrolysis?

Part 3: As the first reaction in part a) proceeds, the pH of the solution increases, decreases, or stays at the same level?

-I would guess decreases, because the water neitralizes it...I don't know, though. Thanks.

What kind of a class is this? These questions can't be answered with just a smattering of a knowledge of chemistry. For a "guess the right answer" type, these are fairly sophisticated.

1. Adding salt of a weak acid to a solution of the weak acid:
a)lowers the concentration of the nonionized acid and the concentration of the H30+
b)lowers the concentration of the nonionized acid and raises the concentration of the H30+
c)raises the concentration of the nonionized acid and the concentration of the H30+
d)raises the concentration of the nonionized acid and lowers the concentration of the H30+

I chose c.

For a weak acid, which I will call HA, it ionizes this way.
HA ==> H^+ + A^-
The sodium salt, NaA, would increase A^-. According to Le Chatelier's Principle, the reaction will shift in such as way as to relieve the stress placed on the equilibrium. In this case, the reaction will shift to the ?LEFT because that is the way to use up the added A^-. So, H^+ will decrease and HA will increase. Of the answers listed, d is the correct one.


2. Salts of a weak acid and stong base produce solutions that are:
acidic, basic, neautral, or all 3?

I said all 3.
Let's choose a salt of a weak acid and a strong base. We might choose a weak acid, such as acetic acid, which I will call HAc, and a strong base such as NaOH. That will produce the salt which is a salt of a weak acid and a strong base. Think about what happens when NaAc hydrolyzes in water.
NaAc + HOH ==> NaOH + HAc. I have taken some liberties with the equation (for example, Na doens't hydrolyze). So the solution will be basic. Common sense tells you that a strong base and weak acid will be basic.


3. If an acid is added to a solution of a weak base and it's salt,
a)more water is formed and more weak base ionizes
b) hydronium-ion concentration decreases
c) more hydroxide ion is formed
d) more nonionized weak base is formed

b?
I am a little confused by the answers. If we take a weak base, such as NH3, and a salt of the weak bsse, such as NH4^+, the addition of a strong acid to that (HCl for example) will cause the NH3 to form more NH4^+ and more H2O will be formed. That is answer a. But answer c is correct, too, although OH^- won't increase much.

4. Label 2 conjugate acid-base pairs as acid 1, acid 2, base 1 and base 2:

a) CO3 + H3O->HCO3 + H2O


b)HPO4+H2O->OH+H2PO4

I'm not really sure how to do this at all, I just know that the ones begiining with "h" are acids..

Part 2: Which reaction in part a) is hydrolysis?

Part 3: As the first reaction in part a) proceeds, the pH of the solution increases, decreases, or stays at the same level?

-I would guess decreases, because the water neitralizes it...I don't know, though. Thanks.

For these questions, I will refer you to your notes/ text where you should read about the Brosted-Lowry theory of acids and bases. All of this will be discussed there.

Thanks...as to your question, it's an advanced Chemistry class, if that's what you mean...he just moves so fast sometimes, that we get through a few chapters a day. It's hard to keep up. :[

OK. Then the explanations I gave were not too technical for you to understand.

Not at all. I can understand it just fine if it's in front of me with a split second to comprehend it...thank you.

  1. 👍 0
  2. 👎 0
  3. 👁 198
asked by Trish

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    You are asked to prepare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and some added sodium benzoate salt (C6H5COONa). a) Find the pH of the benzoic acid solution BEFORE adding the salt.

    asked by Lacy on February 13, 2013
  2. Chemistry

    You are asked to prepare a pH = 4.00 buffer starting from 1.50 L of 0.0200 M solution of benzoic acid (C6H5COOH) and some added sodium benzoate salt (C6H5COONa). a) Find the pH of the benzoic acid solution BEFORE adding the salt.

    asked by Lacy on February 13, 2013
  3. chem

    What advantage is there to adding salt to cooking water? and what conditions are necessary for ideal carbonation of a beverage? please help http://www.miniscience.com/projects/Saltwater/index.html

    asked by Horacio on May 20, 2007
  4. math

    You have an aquarium for your new pet, “Shamu” the killer whale, that contains 100,000 pounds of ocean water with a salinity of 30 o/oo. a. Calculate how many pounds of salt are currently in the aquarium. b. You think Shamu

    asked by amanda on August 21, 2012
  5. Chemistry

    1. What does adding a salt like KCL do to the pH of a solution? 2. What does adding a base like KOH do to the pH of a solution

    asked by Sarah on September 17, 2014
  6. Math help please?

    I have a hard time understanding the process of adding fractions with unlike denominators, and I usually will go on Khan Academy to look at tutorials and walkthroughs but I can't do that during school (only when I'm doing my

    asked by min yoonghy on January 25, 2018
  7. math

    what is a quickway to learn how to mutlplying fractions flash cards: make and use them. how do you do Adding and Subtracting Rational Expressions? I want ot know what the numbers or factors of the number 81 are becasues that uis

    asked by lakeisha on March 14, 2007
  8. Chemistry

    Help needed on a homework problem - solution of HCN and CN- , Ka 6.2x10^-10 . Is this a buffered solution? Shouldn't the pH be greater than 7, and [OH] >[H]? Does adding a strong acid have more effect than adding a strong base?

    asked by Laura on April 25, 2010
  9. IR chemistry - instrumental anaylsis

    my last instrumental analysis lab was basically about becoming familiar with using an IR spectrometer. I used a salt solution with a sodium chloride salt plate although it was not stated in the procedure to do so. the IR spectra

    asked by Instrumental on October 7, 2013
  10. science

    How could you show that adding salt in water resulted ina physical change?

    asked by bella on October 10, 2007
  11. writing skills

    Do your homework before applying for any job. If you rewrote sentence 5 beginning with Be sure that you the next words should be 1 got done your homework 2 got your homework done 3 had done your homework 4 did your homework 5 have

    asked by piper on June 28, 2016

More Similar Questions