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guajiro [1.7K]
3 years ago
6

A student working in the laboratory prepared the following reactants: 5 mL of 0.007M Cd2+(aq) 10 mL of 0.008M SCN-(aq) 10 mL of

0.5M HNO3(aq) These reagents were mixed and allowed to stand for 10 minutes. The concentration of Cd(SCN)+ in the resulting equilibrium mixture is found to be 5 x 10−4M. Calculate the initial concentration of Cd2+(aq).
Chemistry
1 answer:
devlian [24]3 years ago
3 0

Answer:

Initial concentration of cadmium ion before reaching equilibrium is 0.0014 M.

Explanation:

Moles=Concentration\times Volume (L)

Concentration of cadmium ion = [Cd^{2+}]=0.007M

Volume of cadmium solution = 5 mL = 0.005 L

Moles of cadmium ion = =0.007 M\times 0.005 L

1 mL = 0.001 L

Concentration of thiocyanate ion = [SCN^{-}]=0.008 M

Volume of thiocyanate solution = 10 mL = 0.010 L

Moles of thiocyanate = 0.008 M\times 0.010 L

Concentration of nitric acid = [HNO_3]=0.5 M

Volume of nitric acid solution = 10 mL = 0.010 L

After mixing all the solution the concentration of cadmium ion and thiocyanate ion will change

Total volume of solution = 0.005 L + 0.010 L + 0.010 L = 0.025 L

Initial concentration of cadmium ion before reaching equilibrium :

= \frac{0.007 M\times 0.005 L}{0.025 L}=0.0014 M

Initial concentration of thiocyanate ions before reaching equilibrium :

= \frac{0.008 M\times 0.010 L}{0.025 L}=0.0032 M

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The mole of a substance is related to it's mass and molar mass according to the following equation:

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