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Free CBSE - Class 11 Chemistry - Equilibrium worksheets

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1.
The concentration of sulphide ion in 0.1M HCl solution saturated with hydrogen sulphide is $1.0 \times 10^{-19}$ M. If 10 mL of this is added to 5 mL of 0.04 M solution of the following: $FeSO_4$, $MnCl_2$, $ZnCl_2$ and $CdCl_2$. in which of these solutions precipitation will take place?
2.
What is the maximum concentration of equimolar solutions of ferrous sulphate and sodium sulphide so that when mixed in equal volumes, there is no precipitation of iron sulphide? (For iron sulphide, $K_{sp} = 6.3 \times 10^{-18}$).
3.
What is the minimum volume of water required to dissolve 1g of calcium sulphate at 298 K? (For calcium sulphate, $K_{sp}$ is $9.1 \times 10^{-6}$).
4.
The solubility product constant of $Ag_2CrO_4$ and AgBr are $1.1 \times 10^{-12}$ and $5.0 \times 10^{-13}$ respectively. Calculate the ratio of the molarities of their saturated solutions.
5.
Equal volumes of 0.002 M solutions of sodium iodate and cupric chlorate are mixed together. Will it lead to precipitation of copper iodate? (For cupric iodate $K_{sp} = 7.4 \times 10^{-8}$ ).
6.
The ionization constant of benzoic acid is $6.46 \times 10^{-5}$ and $K_{sp}$ for silver benzoate is $2.5 \times 10^{-13}$. How many times is silver benzoate more soluble in a buffer of pH 3.19 compared to its solubility in pure water?
7.
Calculate the pH of the resultant mixtures:
c) 10 mL of 0.1M $H_2SO_4$ + 10 mL of 0.1M KOH
8.
Determine the solubilities of silver chromate, barium chromate, ferric hydroxide, lead chloride and mercurous iodide at 298K from their solubility product constants given in Table 6.9. Determine also the molarities of individual ions.
9.
Calculate the pH of the resultant mixtures:
b) 10 mL of 0.01M $H_2SO_4$ + 10 mL of 0.01M $Ca(OH)_2$
10.
Calculate the pH of the resultant mixtures:
a) 10 mL of 0.2M $Ca(OH)_2$ + 25 mL of 0.1M HCl
- OR -

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