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If 21 mL of 3.2 x 10–5 M magnesium chloride and 15 mL of 1.5 x...

If 21 mL of 3.2 x 10–5 M magnesium chloride and 15 mL of 1.5 x 10–4 M sodium fluoride are mixed, what are the concentrations of magnesium chloride and sodium fluoride after mixing?

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Answer #1

Lets find the concentration after mixing for MgCl2

Concentration after mixing = mol of component / (total volume)

M(MgCl2) after mixing = M(MgCl2*)V(MgCl2)/(total volume)

M(MgCl2) after mixing = 3.2E-5 M*21.0 mL/(21.0+15.0)mL

M(MgCl2) after mixing = 1.87*10^-5 M

Answer: concentration of MgCl2 = 1.87*10^-5 M

Lets find the concentration after mixing for NaF

Concentration after mixing = mol of component / (total volume)

M(NaF) after mixing = M(NaF*)V(NaF)/(total volume)

M(NaF) after mixing = 1.5E-4 M*15.0 mL/(15.0+21.0)mL

M(NaF) after mixing = 6.25*10^-5 M

Answer: concentration of NaF = 6.25*10^-5 M

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