1. In the laboratory you dissolve 21.3 g of manganese(II) sulfate in a volumetri
ID: 839528 • Letter: 1
Question
1. In the laboratory you dissolve 21.3 g of manganese(II) sulfate in a volumetric flask and add water to a total volume of 500 mL.
What is the molarity of the solution? M.
What is the concentration of the manganese(II) cation? M.
What is the concentration of the sulfate anion? M.
2.In the laboratory you dissolve 24.8 g of sodium acetate in a volumetric flask and add water to a total volume of 375 mL.
What is the molarity of the solution? M.
What is the concentration of the sodium cation? M.
What is the concentration of the acetate anion? M.
3.In the laboratory you dissolve 14.3 g of chromium(III) nitrate in a volumetric flask and add water to a total volume of 250 mL.
What is the molarity of the solution? M.
What is the concentration of the chromium(III) cation? M.
What is the concentration of the nitrate anion? M.
Explanation / Answer
1)
a)
MnSO4 => Mn2+ + SO42-
molarity = no. of moles/ volume in litres
= (21.3/151) / 0.5
= 0.282 M
b) 0.282 M
c) 0.282 M
2) Similarily for CH3COONa
a) molarity of solution = (24.8/82.0343) /0.375= 0.806 M
b) 0.806M
c) 0.806M
3) Cr(NO3)3
a) molarity= (14.3/ 238) / 0.25 = 0.24 M
b) 0.24M
c) 0.72M
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