1. Which of the following is a reaction for a strong acid? a) 3Ca 2+ (aq) +2PO 4

Question

1. Which of the following is a reaction for a strong acid?

a) 3Ca2+(aq)+2PO42-(aq) <-- --> Ca3(PO4)2(s)

b) Mg(OH)2(s) --> Mg2+(aq) + 2 -OH(aq)

c) CH3CO2H(aq) +H2O(l) <-- --> H3O+(aq) + CH3CO2-(aq)

d) HNO3(aq) +H2O(l) --> H3O+(aq) + NO3(aq)

e) NH3(aq) +H2O(l) <-- --> NH4+(aq) + OH-(aq)

2) If the normal boiling point of water is 100 degrees celceus and Kb of water is 0.52 degrees Celceus/m and you have a 0.5 molal solution of Calcium nitrate, what will be the boiling point of the solution? Given T = Kbim? Show your work

a) 99.48 degree C

b) 100 degree C

c) 100.26 degree C

d) 100.52 degree C

e) 100.87 dgree C

Explanation / Answer

1) Ans: d

HNO3 is a strong acid.

2) T = i Kb x molality

Ca(NO3)2 ---------> Ca2+ + 2 NO3-    3 ions

So, i = 3

T = i Kb x molality = 3 x 0.52 x 0.5 = 0.78 oC

T = Bioiling point of solution - boilng point of water

Bioiling point of solution = T + boilng point of water

= 0.78 oC + 100 oC

= 100.78 oC

Therefore,

  boiling point of the solution = 100.78 oC

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