Acids and bases

Question 1

Why would an expression for Kw not include the concentration of water?

Answer 1

-only slightly dissociates
-[H20] is constant

Question 2

What is the expression for Kw?

Answer 2

-Kw = [H+][OH-]

Question 3

How does H= relate to Kw?

Answer 3

-[H+] = the square root of Kw

Question 4

Why would a burette be useful to measure out a solution?

Answer 4

-It can deliver variable volumes

Question 5

Write an expression for the acid dissociation constant of Ka with HX (a monobasic acid).

Answer 5

-Ka = [H=]2 / [HX]

Question 6

What is the formula for sodium carbonate?

Answer 6

-Na2CO2

Question 7

When calculating pH, what should you do to the concentration of [OH-]?

Answer 7

-multiply the [OH-] by two.

Question 8

X- = ?

Answer 8

• Ka x [HX] / [H+]

Question 9

What substance in the air can lower the pH of an alkaline solution and how?

Answer 9

-C02
-It is acidic (a gas) and reacts with an alkaline solution.

Question 10

Equation to calculate pH of a buffer solution

Answer 10

[H+] = Ka x [HCOOCH] / [HCOO-]