Solution A has a pH of 3 and solution Z has

a pH of 6. How many times greater is the

hydronium ion concentration in solution A than

the hydronium ion concentration in solution Z?

(1) 100 (3) 3

(2) 2 (4) 1000

PH of a solution is - ln[H3O+] so, in case of A pH=3 or,-log[H3O+]=3 or,[H3O+]=10^-3 in case of B pH=6 pr,-log[H3O+]=6 or, [H3O+]=10^-6 so, hydronium ion concentration in solution A / the hydronium ion concentration in solution Z = 10^-3/10^-6 = 1000 2) Ca (OH) 2+2 HNO3=Ca (NO3) 2+2 H2O so the answer is 2.