Chemistry homework

1.)What H3O+ concentration corresponds to each pH value: (a) 12.600; (b) 8.300; (c) 4.200?   (a)

×10 M   (b)

×10 M   (c)

×10 M

2.) Convert each H3O+ concentration to a pH value.

b. 8.25 ×10−9 M

3.) Convert each H3O+ concentration to a pH value.

a. 0.053 M

b. 0.0000000159 M

4.) Calculate the H3O+ concentration from each pH: (a) 2.40; (b) 8.70.   (c)

×10 M   (b)

×10 ----------------------- M

5.)

Calculate the value of [−OH] from the given [H3O+] in each solution and label the solution as acidic or basic:  

(a) [H3O+] = 2.2 ×10−11 M;

(b) [H3O+] = 3.8 ×10−2 M.

  (a)

×10 M,   (b) ×10 M,

6.) Calculate the value of [H3O+]from the given [−OH]in each solution and label the solution as acidic or basic:  

(a) [−OH]= 7.1 ×10−9 M;(b) [−OH]= 9.4 ×10−4 M.

  (a) ×10 M,   (b) ×10 M,

7.) Calculate the value of

[

OH−

]

from the given

[

H3O+

]

and label the solution as acidic or basic.  

a. 1.9 ×10−5 M

×10 M

b. 7.8 ×10−10 M

×10 M

8.) Calculate the pH of each aqueous solution: (a) 0.0066 M HCl; (b) 0.000012 M KOH.

a.)

b.)

(select)

(select)

-

3

basic

acidic

acidic

basic

acidic

basic

(select)