Ul the tollowing substances, an aqueous solution of will form basic solutions. N

Question

Ul the tollowing substances, an aqueous solution of will form basic solutions. NaHS Cu(NO3)2 KHCO3 NaF A) NaF only B) NaHS, Cu(NO3)2 C) NaF, KHCO3 D) NaHS, KHCO3 and NaF E) KHCO3, NaHS 7. 68) Of the following substances, an aqueous solution of will form basic solutions. NH4Br Pb(NO3)2 K2CO3 NaF A) NH4Br only B) NaF, K2CO3 C) K2CO3, NH4Br D) NaF only E) NH4Br, Pb(NO3)2 will have the highest pH. 69) Of the compounds below, a 0.1 M aqueous solution of A) NaCIO, Ka of HCIO 32 10-8 B) KCN, Ka of HCN-40% 10-10 C) NH4NO3, Kb of NH3 1.8x 10-5 D) NaOAc, Ka of HOAc 1.8 10-5 E) NaHS, Kb of HS18 10-7

Explanation / Answer

The answers are

For (67) D) NaHS,KHCO3 and NaF

For (68) B) NaF,K2CO3

For (69) B) KCN, Ka of HCN=4.0*10-10

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