HONH3 Conjugate Base HONH2 Conj Base is weak Cation is an ac

HONH3+ Conjugate Base HONH2 Conj. Base is weak Cation is an acid 03:21 Minimize embedded content What is the pH of a 0.100 M solution of NaC2H302 when Ka(HC2H3O2) 18 x105? 2.87 8.87 o 5.13 9.37 D 11.13 Question 5 Classify the compound K2COs as acidic, basic or neutral. The K,lHCOg)is 5.6 1011

Solution

4)

Pka = -log Ka = - log (1.8 * 10^-5) = 4.74

PKa = 4.74

this weak acid.

so

PH = 0.5 * PKa - 0.5 * log C

PH = 0.5 * 4.74 - 0.5 * log (0.100)

PH = 2.37 + 0.5

PH = 2.87 (answer)

5)

K2CO3 is a salt strong base(KOH) and weak acid (HCO₃^-).

so HCO₃^- react with water to produce OH-.

HCO₃^- + H2O ............> H2CO3 + OH-

Hence this is basic .