. The ionization of phosphoric acid, H3PO4(aq), involves multiple reactions. The ionization constants are Ka1, Ka2, and Ka3, respectively. In a solution of 1.0 mol/L H3PO4(aq), which of the following will have an equilibrium concentration approximately equal to 6.2*10^-8 mol/L?
Chemistry
1. The ionization of phosphoric acid, H3PO4(aq), involves multiple reactions. The ionization constants are Ka1, Ka2, and Ka3, respectively. In a solution of 1.0 mol/L H3PO4(aq), which of the following will have an equilibrium concentration approximately equal to 6.2*10^-8 mol/L?
a) H^+
b) H3PO4
c) H2PO4^-
d) HPO4^2-
e) PO4^3-
2. A solution is prepared by dissolving 0.010 moles of formic acid (HCOOH) in water to make 1.0 L of solution. Which of the following actions, considered independently, causes an increase in both the pH of the solution and the percentage ionization of HCOOH?
(i) diluting with water to a final volume of 2.0 L;
(ii) adding 0.004 moles of sodium formate, NaHCOO;
(iii) adding 0.004 moles of HCl
a) (i) only
b) (ii) only
c) (iii) only
d) both (i) and (ii)
e) both (ii) and (iii).
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