Chemistry Quiz

Name______

Period______

Chemistry Quiz

II. Matching

______1) Red in litmus ______7) pink in phenolphthalein

______2) [OH-] > [H+] ______8) vinegar a) acid

______3) pOH = 6.3 ______9) tastes sour

______4) NaNO3(aq) ______10) [OH-] = [H+] b) base

______5) KC2H3O2 (aq) ______11) [H+] = 3.4 X 10-9

______6) pH = 5.2 ______12) NH4Cl(aq) c) neutral

III. For each of the following reactions label the acid (a), the base (b), the conjugate acid (ca), and the conjugate base (cb).

1) H2CO3 + OH- HCO3 - + H2O

______

2) CH3NH2 + H2O CH3NH3+ + OH-

______

3) HBr + H2O H3O + + Br-

______

IV. Problems. You must show your work for credit.

1)  Given [OH-] = 1.5 x 10 –5, find [H+] , pH , pOH and tell if it is acidic or basic.

[H +] =

pH =

pOH =

acidic or basic

2)  Given pH = 5.7, find [OH-] , pOH , [H+] and tell if it is acidic or basic

[OH -] =

pOH =

[H+] =

acidic or basic

3)  Find the pH of a 0. 0045 M solution of NaOH.

3)

4)  The pH of a 0.063 M solution of hypobromous acid (HBrO) is 4.95. Calculate Ka.

4)

5) How many mL of a 0.34 M of HCl are needed to neutralize 125 mL of a 0.11 M Ba(OH)2 ?

5)

6) What is the molar concentration of15 ml H3PO4 if it takes 25 mL of 0.85 M NaOH to neutralize the acid ?

6)

7 How many equilivants are in 6.34 L of a 0.75N solution of H3PO4

7)

8a) ______Mg(OH)2 + ______HBr

8b) ______Al(OH)3 + ______H2CO3

9 If 25.00 mL of citric acid solution is titrated with 28.12 mL of 0.1718 N KOH, what is the concentration of citric acid? (hint: normality is a concentration unit!)

10)