6. An undesirable reaction that can occur in aqueous solution when compounds lik

Question

6. An undesirable reaction that can occur in aqueous solution when compounds like acetone, (CHs) CO, react with hypochlorite ion is the formation of chloroform (CHCl3), an environmental pollutant, according to the following reaction: (CH) Cola?) 3NaCIo(a?) CHCls(aq) + NaC2H3Oag)+ 2NaOH(aq) If 20.0 mL of 0.150 M NaCIO is added to 150 mL of an aqueous solution containing 2.43 x 103 M acetone, what would be the molar concentration of chloroform in the solution? Assume the solution volumes are additive.

Explanation / Answer

Moles of NaClO = molarity * volume in L = 0.150 * 0.020 = 0.00300 mol

Moles of (CH3)2CO = 2.43 * 10-3 * 0.150 = 0.000364 mol

From the balanced equation,

1 mol of (CH3)2CO needs 3 mol of NaClO

then, 0.000364 mol of (CH3)2CO needs 3 * 0.000364 = 0.00109 mol of NaClO ( < 0.0030)

So, (CH3)2Co is limiting reagent.

From the balanced equation,

1 mol of (CH3)2CO forms 1 mol of CHCl3

Then, 0.000364 mol of (CH3)2Co forms 0.000364 mol of CHCl3

Volume of final solution = 20.0 + 150. = 170. mL = 0.170 L

Molarity of CHCl3 = moles / volume in L = 0.000364 / 0.170 = 0.00214 M

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