Question 16 Which solution of the following salts is acidic? KNO2 BaF2 K2S NH4Br

Question

Question 16 Which solution of the following salts is acidic? KNO2 BaF2 K2S NH4Br Question 17 What is the [H30'] and pH for a 0.050 M KOH solution? 15.0 x 10-2 M: pH = 13.10 15.0 x 10-2 M: pH = 13.30 1.2.0x 10-13 M; pH - 12.70 1.2.0 x 10-13 M; pH - 11.85 Question 18 Why is arsenic such an effective poison? Because the lethal dosage is both odorless and tasteless Because it can be found in many locations worldwide Because a dosage cannot be found in the body minimal, lethal Because the lethal dosage is extremely s mall Question 19 When an equilibrium exists such that the equilibrium constant, K, is small, what does this indicate about the system? It indicates nothing about the equilibrium. It is in equilibrium. It is mostly reactants. It is mostly products.

Explanation / Answer

6.
    NH4Br is acidic nature due to cationic hydrolysis.
17.KOH --------> K^+ + OH^-
   0.05M               0.05M
   [OH^-]   = [KOH]
   [OH^-]   = 0.05M
    [H^+] = Kw/[OH^-]
           = 1*10^-14/0.05   = 2*10^-13M
    PH = -log[H^+]
        = -log2*10^-13
        = 12.7
1.2*10^-13M ; PH = 12.7
18.Because a dosage cannot be found in the body minimal, lethal.
11.Cd(OH)2 -------> Cd^2+ (aq) + 2OH^-
                     s            2s
Ksp = [Cd^2+][OH^-]^2
7.2*10^-15 = s*(2s)^2
   4s^3       = 7.2*10^-15
    s^3       = 1.8*10^-15
    s         = 1.2*10^-5M
Cd()H)2(s) Ksp = 7.2*10^-15 >>>>answer
12..HF(aq) Ka = 6.3*10^-4 >>>answer
13. decrease H^+ concentration by adding NaOH
14.H2S----> HS^- + H^+
HS^- >>>answer
15.2Al(s) + 6HCl(aq) ----------> 2AlCl3 + 3H2
AlCl3 + H2
6.the equilibrium constant is 1
7.AcL is insoluble in water.
8.if a system at equilibrium is distrubed it will shift to counteract the
disturbance and reestabish equilibrium.
9.

3.b

4.c
5.C

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