Question

4&5

ar sample has been determined to be 1.6 x 10-M. 2 The hydronium ion HOT concentration in a vinegar sample has be Calculate the pH. - 10g (1.6x103) = 2.80m 3. Predict whether aqueous solutions of the following orions of the following compounds will be acidic, basic or neutral. If the solution would be acidic or basic, circle the ion that causes the pH to change b) FC) c) KO) d) KCIO acidic acidic basic neutral e) NaBr 1) Mong) NaF h) LINO Heutral Qadic a) NH BP The pH of a 0.20 M proprionic acid (CH.CH.COOH) solution is 2.79. Calculate the K of proprionic acid Two unknown acid solutions are both labelled 0.50 M. How could you determine which is the strone acid and which is the weak acid? Explain. 243

Answer 1

& att Chcthcoon a chcthcoo (0.200) Ka - [cob Coh coon] [ut] [ch с сон] or, ka = [x] [x] – x² 0.20- x 0.20-X ke have, [hot] = 10pH = 102.29 0.001621 2.79 Мои - PH JO , - 10 0.0016 2-63 2 282828 (070 - 0.00162) – 0.178 - 13.282828 or, 1 kg = 1.38 +105] ③ Higher the concentration of H-ions, the lower lower the pH (more acidic) , and visa versa. - Inorder to differentiate the two giren solutions as Strong or weak acid, firstly i would add Nach and look for the larger temperature change (Enthalpy of neutralisation).