When solutions of silver nitrate and magnesium chloride are mixed, silver chlori

Question

When solutions of silver nitrate and magnesium chloride are mixed, silver chloride precipitates out of solution according to the equation

2AgNO3(aq)+MgCl2(aq)2AgCl(s)+Mg(NO3)2(aq)

Part A

What mass of silver chloride can be produced from 1.23 L of a 0.149 M solution of silver nitrate?

Express your answer with the appropriate units.

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Part B

The reaction described in Part A required 3.45 L of magnesium chloride. What is the concentration of this magnesium chloride solution?

Express your answer with the appropriate units.

Explanation / Answer

part A:

amount of AgNO3 = 0.149 x 1.23 = 0.1833mol

amount of AgCl precipitated = 0.1833 mol

molar mass of AgCl = 107.86 + 35.453 = 143.313g/mol

Mass of AgCl precipitated = 0.1833 x 143.313 = 26.265 g

B:

amount of MgCl2 = n(AgCl)/2 = 0.09165mol

this is dissolved in 3.45 L so the concentration is

c(MgCl2) = n(MgCl2)/V = 0.09165/3.45 = 0.0265 mol/L

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