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AsolutioncontainsCr3+ionandMg2+ion.Theadditionalof1.00Lof1.51MNaFsolutionisrequiredto...
A solution contains Cr3+ ion and Mg2+ ion. The additional of 1.00L of 1.51 M NaF solution is required to cause the complete precipitation of these ions as CrF3 and MgF2. The total mass of the precipitate is 49.6g. Find the mass of Cr3+ in the original solution
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设铬有n mol，镁有 m mol
(52+19*3)n+(24+19*2)m=49.6
3n+2m=1.51
得：
n = 0.174375, m = 0.493437
(52+19*3)n+(24+19*2)m=49.6
3n+2m=1.51
得：
n = 0.174375, m = 0.493437
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