Which hydroxides are weak bases? KOH, NaOH KOH, Ba(OH)_2 Sr(OH)_2, KOH, NaOH, Ba

Question

Which hydroxides are weak bases? KOH, NaOH KOH, Ba(OH)_2 Sr(OH)_2, KOH, NaOH, Ba(OH)_2 KOH, NaOH, Ba(OH)_2 None of these is a weak base. The net ionic equation for the reaction between aqueous sulfuric acid and aqueous sodium hydroxide is H^+ (aq) + HSO_4^_ (aq) + 2Na^+(aq) + 2OH^-(aq) rightarrow 2 H_2O(l) + 2 Na^+ (aq) + SO_4^2- (aq) H^+ (aq) + OH^- (aq) rightarrow H_2O(l) 2H^+ (aq) + SO_4^2- (aq) + 2Na^+ (aq) + 2OH^-(aq) rightarrow 2H_2O(l) + 2Na^+ (aq) + SO_4^2- SO_4^2- (aq) + 2Na^+(aq) rightarrow 2Na^+ (aq) + SO_4^2 - (aq) H^+ (aq) + HSO_4^-(aq) + 2OH^-(aq) rightarrow 2H_2O(l) + SO_4^2-(aq) Which of the following is soluble in water at 25 degree C? Fe_3(PO_4)_2 FeCO_3 Fe(OH)_2 FeS

Explanation / Answer

16)

we know that

KOH , NaOH , Ba(OH)2 , Sr(OH)2 are all strong bases

so

the answer is E) none of these is a weak base

17)

the balanced reaction is

H2S04 + 2 NaOH (aq) --> Na2S04 (aq) + 2 H20 (l)

the total ionic equation is given by

2H+ + S042- + 2 Na+ + 2OH- --> 2 Na+ + S042- + 2 H20

cancel out the common ions

we get the net ionic equation as

2H+ + 2 OH- --> 2 H20

H+ + OH- --> H20

so

the answer is B) H+ + OH- --> H20 (l)

18) all nitrates are soluble

so the answer is E) Fe(N03)2

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