Hello Chegg family i have a few titration and oxidation problems. Thank You! 1.)

Question

Hello Chegg family i have a few titration and oxidation problems. Thank You!

1.) You need to make an aqueous solution of 0.234 M manganese(II) acetate for an experiment in lab, using a 500 mL volumetric flask. How much solid manganese(II) acetate should you add? ?grams

2.) How many milliliters of an aqueous solution of 0.129 M ammonium chloride is needed to obtain 9.41grams of the salt? ?mL

3.)In the laboratory you dissolve 16.4 g of chromium(II) bromide in a volumetric flask and add water to a total volume of 125 . mL.
What is the molarity of the solution? ?M

4.) In the laboratory you dissolve 23.4 g of manganese(II) acetate 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 acetate anion? M.

In the laboratory you dissolve 12.9 g of ammonium chloride 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 ammonium cation? M.
What is the concentration of the chloride anion? M.

Explanation / Answer

Ans 1 :

Molarity = no. of moles of solute / volume of solution in L

0.234 = n / 0.500

n = 0.117 mol

Molar mass of Manganese (II) acetate is 173.027 g/mol

So the mass of manganese (II) acetate to be added : 173.027 x 0.117

= 20.24 grams

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