Which weak acid fields a buffer solution closest to neutral pH when paired w ith
ID: 996395 • Letter: W
Question
Which weak acid fields a buffer solution closest to neutral pH when paired w ith an equal concentration of its conjugate base? acetic acid (K_a = 1.8 times 10^-5) bicarbonate ion (K_a = 5.6 times l0^-11) boric acid (K_a = 5.4 times 10^-16) dihydrogcn phosphate ion (K_a = 62 times 10^-8) Which salt will form a neutral aqueous solution? NaF Sr(C_2H_3O_2)2 KBr NH_4CI What is the pH of an aqueous solution of equal volumes of 0.60 M nitrous acid. HNO_2, and 0.30 M sodium nitrite, NaNO_2? The K_a of HINO_3 is 4.46 times 10^-4. 5.73 4.12 3.05 2.78 The pH of an aqueous 000796 M solution of HIO_3 is 2.12. What is the K_a.of HIO_3? Do not assume that ionization is negligible with respect to the initial concentration. 0.16 0.0076 0.0037 0.21 According to Lewis theory, a Lewis acid is a(n) proton donor. electron-pair donor. proton acceptor. elcctron-pair acceptor. Which acid is likely to result in the greatest percent ionization in aqueous solution? 1 M HC_2H_2BrO_2; K_a = 13 times 10^-3 1 M HCHO_2; K_a = 1.8 times l0^-4 1 M HIO; K_a = 3.2 times 10^-11 I M H_2S; K_a = 1.0 times l0^-7; K_a = 1.0 times 10^-19 A buffer solution consists of 0.100 mol of acetic acid (pK_a = 4.74) and 0.100 mol of sodium acetate in 1.00 L of aqueous solution. How much w ill the pH increase if 0.010 mol of NaOH is added to the solution? (Assume that the volume remains constant.) 0.040 0.087 0.15 022 Which conjugate acid/base pair is not correctly matched? H_2SO_4 and SO_4^2- H_2O andOH^- HBr and Br^- HNO_3 and NO_3 What is the pH of a 1.4 M aqueous hypochlorous acid solution? The K_a for hypochlorous acid is 2.9 times 10^4 0.15 3.70 3.77 7.54 Which sketch best represents the titration of a weak diprotic acid with a strong base? Identify and justify the Bronsted-Lowry acid in the reaction: NH_3 + HBr rightarrow NH_4Br NH_3 because it it a proton door HBr because it is a proton donor NH_3 because it is a proton acceptor HBr because it is a proton acceptor Which two elements form a compound with the stoichiometry X_2Y_3? X Y Na O Mg S Al Cl Al OExplanation / Answer
1) Bi carbonate ion
Reason: Its Ka value is very less, The value indicates the Acid strength.
2) NaF
Reason: NaOH + HF ---------> NaF + H2O
NaOH is the strong base and the HF is the strong acid, The salt from strong acid-strong base is the Neutral.
3) PH = Pka + log [salt]/[Acid]
Ka = 4.46 x10-4
Pka = -log10Ka
Pka = -log10 [ 4.46 x 10-4]
Pka = 4 - log 4.46
Pka = 4 - 0.6493
Pka = 3.3507
PH = Pka + log [salt]/[Acid]
salt (sodium nitrite) concentration = 0.3M
Acid (Nitrous acid) concentration = 0.6 M
PH = 3.3507 + log [0.3] / [0.6]
PH = 3.3507 + log 0.5
PH = 3.3507 - 0.301
PH = 3.0497
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