Solutions

a. Na₂[Ca(EDTA)] ® 2 Na⁺ + [Ca(EDTA)]^2-

[Ca(EDTA)]^2- Û Ca²⁺ + EDTA^4-

neutral

b. Cr(NO₃)₃ ® Cr³⁺ + 3 NO₃^-

[Cr(H₂O)]³⁺ Û H⁺ + [Cr(OH)(H₂O)₅]²⁺

slightly acidic (pH < 7)

c. Sr(ClO₃)₂ ® Sr²⁺ + ClO₃^-

neutral

d. [Zn(NH₃)₄]I₂ ® [Zn(NH₃)₄]²⁺ + I^-

[Zn(NH₃)₄]²⁺ Û Zn²⁺ + 4 NH₃

neutral

e. KCH₃CO₂ ® K⁺ + CH₃CO₂^-

CH₃CO₂^- + H₂O Û CH₃COOH + OH^-

slightly basic (pH > 7)

f. Ag₂S Û 2 Ag⁺ + S^2-

neutral

g HOCl Û H⁺ + OCl^-

slightly acidic (pH < 7)

h. Na₂CO₃ ® 2 Na⁺ + CO₃^2-

CO₃^2- + H₂O Û HCO₃^- + OH^-

slightly basic (pH > 7)

i. KHSO₄ ® K⁺ + HSO₄^-

HSO₄^- Û H⁺ + SO₄^2-

slightly acidic (pH < 7)

j. NH₄F ® NH₄⁺ + F^-

NH₄⁺ Û NH₃ + H⁺ (Ka = 5.6 X 10^-10)

F^- + H₂O Û HF + OH^- (Kb = 1.4 X 10^-11)

Since F^- is a weaker base than NH₄⁺ is an acid, the solution will be slightly acidic.

l. NaF ® Na⁺ + F^-

F^- + H₂O ® HF + OH^-

slightly basic (pH > 7)

m. HCN Û H⁺ + CN^-

slightly acidic (pH < 7)

n. C₅H₅N + H₂O Û C₅H₅NH⁺ + OH^-

slightly basic (pH < 7)

o. NH₄NO₃ ® NH₄⁺ + NO₃^-

NH₄⁺ Û NH₃ + H⁺

slightly acidic (pH < 7)

p. K₂SO₃ ® 2 K⁺ + SO₃^2-

SO₃^2- + H₂O Û HSO₃^- + OH^-

slightly basic (pH > 7)

q. CaSO₄ ® Ca²⁺ + SO₄^2-

neutral

r HClO₂ Û H⁺ + ClO₂^-

slightly acidic (pH < 7)

s. HI ® H⁺ + I^-

strongly acidic (pH << 7)

t. LiOH ® Li⁺ + OH^-

strongly basic (pH >> 7)

u. KCl ® K⁺ + Cl^-

neutral

v. Na₂HPO₄ ® 2 Na⁺ + HPO₄^2-

HPO₄^2- + H₂O Û H₂PO₄^- + OH^- (Kb = 1.7 X 10^-7)

HPO₄^2- Û H⁺ + PO₄^3- (Ka = 3.6 X 10^-13)

Since the Kb is larger, the solution is slightly basic

w. MnS Û Mn²⁺ + S^2-

neutral

x. Hg₂Cl₂ Û Hg₂²⁺ + 2 Cl^-

neutral

y. K[Al(OH₂)₂(OH)₄] ® K⁺ + [Al(OH₂)₂(OH)₄]^-

[Al(OH₂)₂(OH)₄]^- Û Al³⁺ + 2 H₂O + 4 OH^-

z. Ba(OH)₂ → Ba²⁺ + 2 OH^-

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