In the laboratory you dissolve 12.7 g of chromium(II) chloride in a volumetric f

Question

In the laboratory you dissolve 12.7 g of chromium(II) chloride in a  volumetric flask and add water to a total volume of 375mL

what is the molarity of the solution?

What is the concentration of the chromium (II) cation?

what is the concentration of the chlorine anion?

In the laboratory you dissolve 15.5 g of nickel bromide in a  volumetric flask and add water to a total volume of 125 mL.

What is the molarity of the solution?

What is the concentration of the nickel cation?

what is the concentration of the bromide anion?

Explanation / Answer

moles of CrCl2 = 12.7/122.9 = 0.1033

Vol = 375 ml = 0.375 liters

M = ( 0.1033/0.375) = 0.275

[Cr2+] = 0.275

[Cl-] =2 x0.275 = 0.55

2) NiBr2 moles = 15.5/218.53 = 0.071

Vol = 125 ml = 0.125 Liters

M = ( 0.071/0.125) = 0.567

[Ni] = 0.567

[Br-] = 0.567 x 2 = 1.135

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