Sort each of the following events based on whether the solubility of the indicat

Question

Sort each of the following events based on whether the solubility of the indicated gas will increase, decrease, or stay the same. Each phrase specifies the gas involved and the change in its environment. A 4.96 g sample of a laboratory solution contains 1.79 g of acid. What is the concentration of the solution as a mass percentage? Lead(ll) nitrate and ammonium iodide react to form lead(ll) iodide and ammonium nitrate according to the reaction Pb(NO_3) (aq) + 2NH_4l(aq) rightarrow PbI_2(s) + 2NH_4NO_3(aq) What volume of a 0.290 M NH_4I solution is required to react with 155 mL of a 0.580 M Pb(NO_3)_2 solution? How many moles of Pbl_2 are formed from this reaction?

Explanation / Answer

1)

gas solubility increases :

a) the pressure of a gas over a solvent is increased

b) A person is placed in a hyperbaric chanber

c) the partial pressure of an anesthetic gas is increased

gas solubility decreases :

a) the temperature is increased

b) a can of soda warms to room temperature

gas solubility does not change :

none

2) we know that

% mass = mass of component x 100 / total mass

so

% mass of acid = mass of acid x 100 / total mass

so

% mass of acid = 1.79 x 100 / 4.96

% mass of acid = 36.09

3)

the given reaction is

Pb(N03)2 + 2 Nh4I --> PbI2 + 2 NH4N03

we can see that

moles of NH4I required = 2 x moles of Pb(N03)2

also

we know that

moles = molarity x volume

so

M x V of NH4I = 2 x M x V of Pb(N03)2

so

V x 0.29 = 2 x 0.58 x 155

V = 620

so

620 ml of Nh4I is required

now

moles = molairty x volume

so

moles of Pb(N03)2 taken = 0.58 x 155 x 10-3 = 0.0899

now

from the reaction

we can see that

moles of PbI2 formed = moles of Pb(N03)2 reacted

so

moles of PbI2 formed = 0.0899

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