MULTPLE CHOICE 1) Of the acids in the table below, is the strongest acid. 1) Aci

Question

MULTPLE CHOICE 1) Of the acids in the table below, is the strongest acid. 1) Acid HOAc 1.8 105 HC02 | 1.8 × 10-4 HCIo 3.0 10-8 HF 16.8 × 10-4 A) HOAc and HCHO2 B) HF Q HCIO D) HOAc E) HCHO2 2) In which of the following aqueous solutions does the weak acid exhibit the highest percentage 2) ionization (ji.e. the strongest acid)? A) 0.01 M HNO2 (Ka-45 10-4) B) 001 M HC2H302 (K -180-5 0.01 M HCIO (K 3.0 10-8 D)0.01 M HF (Ka-68 × 10-4) E) These will all exhibit the same percentage ionization. 3) The Ka of hypochlorous acid (HOO) is 30m 10-8 at 25.0C What is the % ionization of 3) hypochlorous acid in a 0.015 M aqueous solution of HCIO at 25.0 C? A) 1.4 10-3 B)21 10-5 9014 D)4.5 × 10-8 E)14 4) 4) Classify the following compounds as weak acids (W) or strong acids (S) benzoic acid nitric acid acetic acid B)WSS Qsss D) WSw A) WWw

Explanation / Answer

1) (B) HF , because it has highest Ka value.

Ka as a measure of acid strength. A larger equilibrium constant means that the reaction has a greater tendency to drive towards the products side (more H3O+ and A–, less HA). Another way of saying this is that the acid has a stronger tendency to donate its H+, which is the definition of a stronger acid.

2) (A) C7H5OO-, because it has lowest Ka value.

Low values of Ka mean that the acid does not dissociate well and that it is a weak acid.

3) degree of ionisation X = Ka initial concentration

X= .015× 3×10^-8

= .2121×10^-4

% ionisation = X/initial concentration ×100

= .2121×10^-4 (100)/ .015

= .14

Answer (C)

4) D , because nitric acid is strong acid , which other are weak.

Only four questions will be answered at a time as per Chegg policy.

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