Question

8. What is the pH of a 5.00 x 102 M Ba(OH)2(aq) solution at room temperature? a. 1.00 b. 1.30 c. 12.02 d. 12.70 e. 13.00 9. Assuming equal concentrations of conjugate acid and base, which one of the following mixtures is suitable for making a buffer solution with an optimum pH of 4.6-4.8? a. CH3COONa/CH3COOH (K = 1.8 x 105) b. NH/NHACI (K = 5.6 x 10-1) c. NaOCI/HOCI (Ka = 3.2 x 108) d. NaNO2/HNO2 (Ka = 4.5 x 10) e. Naci/HCI 10. The pKis a reliable measure of the strength of an acid. Strong acids have larger pk, values than weak acids. True or False?

Answer 1

8) pH of in. 5.00 8 10 ²M Baloh solution & Baloh), is strong base. completly dimocrates into ions aqueous (29) Bodt (aq) +204 (ag) [OH-] = 9X (5.00x162) - 10.0x102 M solution. Baloh? PH - log [ 43 of [OH-] = 1.0810 --14 10.0x102 = 10x1013 13.00 pH = -log (60 X1013) = TpH = 13:00

9) Buffer solution having pH = 4.6-4.8 ie when a salt an acidic solution . is added with a) Cu Coona/C4,C00H make a buffer howing pH = 4.6 -4.8 CH₃COONa is sodium salt of acadie aad. And CHCOOH as is acetic acid, a weak acid. b), c) d), e) doesn't make a buffer which is required.. In (b), NHg is strong base, it cant make an acidic buffer In (C), Nooch is weak base. But to make a buffer, we need a salt. In (d), NoNo, is weak base and HNog weak acid • No buffer formation In(e) Hol is strong acid. It can't make butter. 9

strong 10) false. acids have lower pka values and weak acids have values. higher pko pha tells how much tighty a proton is held acid . Lower the pka, the more easily acid can give protons. St Strong protons and that us why strong acids have low pko values. I by acids easily give