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20 December, 05:29

Which one of these salts will form a basic solution on dissolving in water?

A. NaCl

B. KCN

C. NaNO3

D. NH4NO3

E. FeCl3

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Answers (1)
  1. 20 December, 09:21
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    KCN forms a basic solution (option B)

    Explanation:

    Step 1: Data given

    Acids have form AH, with conjugate base A-.

    Bases have the form BOH, with conjugate acid B+.

    Strong acids have weak conjugate bases

    Strong bases have weak conjugate acids

    Weak acids have strong conjugate bases

    Weak base have strong conjugate acids

    a) NaCl.

    Na + is a conjugate acid of NaOH, what is a strong base.

    Cl - is the conjugate base of HCl, what is a strong acid.

    They form a neutral solution

    b) KCN.

    K + is a conjugate acid of KOH, what is a strong base.

    CN - is the conjugate base of HCN, what is a weak acid.

    K + is a weak conjugate acid, CN - is a stronger conjugate base

    They form a basic solution

    c) NaNO3.

    Na + is a conjugate acid of NaOH, what is a strong base.

    NO3 - is the conjugate base of HNO3, what is a strong acid.

    They will form a neutral solution

    d) NH4NO3.

    NH4 + (ammonium) is the conjugate acid of NH3, what is a moderately strong base.

    NO3 - is the conjugate base of HNO3, what is a strong acid.

    Ammonium is a stronger conjugate acid, nitrate is a weak conjugate base.

    The solution is acid.

    e) FeCl3 is an acid salt because Fe (OH) 3 is weak base and HCl is a strong acid. pH is less than 7.

    Fe^3 + is the conjugate acid of Fe (OH) 3, what is weak base.

    Cl - is the conjugate base of HCl, what is a strong acid.

    Fe^3 + is a 'stronger' conjugate acid, Cl - is a weaker conjugate base.

    They solution is acid
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