Express the concentration of a 0.0400M aqueous solution of fluride,F-, in mass percentage and in parts...

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Express the concentration of a 0.0400M aqueoussolution of fluride,F-, in mass percentage and in parts permillion.Assume the density of the solution is 1.00f/mL.

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4.2 Ratings (873 Votes)

Molar mass of fluoride is 19g/mol

Given concentration =0.0400 M

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.0400 mol /L

We know that number of moles,n = mass/molarmass

So mass of fluoride,m = 0.0400 mol x 19 g/mol

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.76 g

So 0.76 g of F^- Present in 1L=1000 mL of solution

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1000 mL x 1.00 g/mL

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 1000 g

So mass percentage = mass of F^- / mass of solution

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.76 g / 1000 g

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 0.00076 %

0.76 g present in 1000 mL = 0.76 g/1L

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 760 mg/1L

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 760 ppmÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â since 1ppm = mg/L

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Express the concentration of a 0.0400M aqueous solution of fluride,F-, in mass percentage and in parts...

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60.1K

Verified Solution

Question

Chemistry

Express the concentration of a 0.0400M aqueoussolution of fluride,F-, in mass percentage and in parts permillion.Assume the density of the solution is 1.00f/mL.

Answer & Explanation Solved by verified expert

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