Question
Asked Feb 2, 2020
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A solution contains Cr3+ and Mg2+. The addition of 1.00 L of 1.51 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 50.1 g .

Find the mass of Cr3+ in the original solution. 

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Expert Answer

Step 1

A solution contains Cr3+ and Mg2+. The addition of 1.00 L of 1.51 M NaF solution is required to cause the complete precipitation of these ions as CrF3(s) and MgF2(s). The total mass of the precipitate is 50.1 g.

The mass of Cr3+ in the original solution is to be determined.

Step 2

Cr3+ and Mg2+ react with NaF to form precipitate of CrF3 and MgF2 respectively.

Chemistry homework question answer, step 2, image 1
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Step 3

Calculate the moles of NaF-

Molarity of NaF = 1.51 M

...
Chemistry homework question answer, step 3, image 1
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Physical Chemistry

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