Question

can you answer the following?

13) A substance that is capable of acting as both an acid and as a base i D) miscbie 14) The molar cancentraton of hydraniam ion in pure water at 25t is A) 10-10-7 B) 1.0 10-14 C) 700 0) 100 E) 000 15) Of the acids in the table below. s the strangest acid A) HOAe C) HCIO E) HOAG and HCH02 16) Whieh one af the following statements regrding K is tae 16 A) The value of K is always 1.0-10- B) Kw known as the ion product of water pkis 14.00C D) Kwchanges with temperatare E) The vaiue o! K. shows that water尊a weak acid 17) or the following acids, set a strong acid 17) A) H2S04 HNO C) HC E) HNO2 18) Calealate the pH off a buffer than is 0.22S M HC2H302 an 0.162 M KC2 H202 The K for 18 474 0) 811 E)826

Answer 1

13) C

Amphoteric compounds are those which react with both base and acids

14) A

The auto-dissociation of water has an equillibrium constant of 10^-14. And [H⁺][OH^-] = 10^-14

Since [H⁺] = [OH^-] for pure water we have [H⁺] =10^-7

15) B

Acid with the highest K_a will be the strongest.

16) E

Because K_w shows that water is both weak acid and weak base

17) E

H₂SO₄, HNO₃, HCl and HClO₄ all strong acids. One of the reasons HNO₂ is weak beacause N is in a lower oxidation state.(+3)

18) C

$pH = pK_{a} + log\frac{[CH_{3}COO^{-}]}{[CH_{3}COOH]} \\ \Rightarrow pH = -log(1.8\times 10^{-5}) + log\frac{0.162}{0.225} \\ \Rightarrow pH = 4.60$