Whta is the [OH-] in an aqueous solution at 25*c in which the [H3O]=10^2M? a. 10

Question

Whta is the [OH-] in an aqueous solution at 25*c in which the [H3O]=10^2M?

a. 10^-14 M

b. 10^-12 M

c. 10^-7 M

d. 10^-3 M

what is the concentration of the sulfate ion, SO-2 4, in a 0.50 M solution of Al2(SO4)3?

a. 0.50M

b. 1.0 M

c. 1.5 M

d. 3.5 M

Which combination of dilute aqueous reagents will not produce a precipitate?

a. Pb(NO3)2 + Na2S-

b. Ba(No3)2 + Na2 SO4

c. AgNO3 + HCl

d. HCl + NaOH

What will be the new concentratioin of a solution when 600 mL of a 0.60 M solution of HCl is diluted to 1000 mL?

a. 0.060 M

b. 0.36 M

c. 0.60 M

d. 1.0 M

WHich pair of ions will form a percipitate when 0.1 M solutions of the repective ion are mixed?

a. NH4+ and PO 3- 4

b. Ca+2 and CH3 COO-

c. Pb 2+ and Cl-

d. Al3+ and NO-, 3

Explanation / Answer

1) b

[H3O+] [OH-] = 10-14 ionic product of water

so [OH-] = 10-14 / 102 = 10-16

i think you have typo error [H3O+] = 10-2 ten answer will be 10-12

2) c

Al2So4 can produce 3 ions of SO32-

so 3 x 0.5 = 1.5M

3) d

HCl + NaOH its anuetralisation reaction

4) b

M2 = 600 x 0.6 / 1000 =360 / 1000 = 0.36

5) c

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