Which of following compound will not dissolve in hot mixture of NaOH and H₂O ?

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6-2.Equilibrium-II (Ionic Equilibrium)

easy

Which of the following compound will not dissolve in hot mixture of $NaOH$ and $H_2O$ ?

$Fe(OH)_3$

$Al(OH)_3$

$Cr(OH)_3$

$Zn(OH)_2$

Solution

Most hydroxide salts are insoluble. For example, the solubility of $Fe ^{+3}$ in basic solution is governed by the reaction shown in (eq 1), from which the corresponding equilibrium constant expression can be derived (eq 2). The equilibrium constant for the reaction $K _{s p}$ is $6.3 \times 10^{-38}$ which says that $Fe ( OH )_3$ is sparingly soluble under most conditions. Equation 3 says that the solubility of ferric ion rapidly decreases as the solution becomes more basic.

$Fe ( OH )_3 \rightleftharpoons Fe ^{+3}+3 OH ^{-}——(1)$

$K _{ sp }=\left[ Fe ^{+3}\right]\left[ OH ^{-}\right]^3—^{-(2)}$

$\text { Solubility }=\left[ Fe ^{+3}\right]=\frac{ K _{ sp }}{\left[ OH ^{-}\right]^3}——(3)$

Standard 11

Chemistry

What is the solubility of calcium fluoride in a saturated solution, if its solubility product is $3.2 \times {10^{ – 11}}$

medium

The concentration of $500$ $ML$ $NaOH$ solution is $0.02$ $M$. How many grams of $FeS{O_4}$ added in this solution for precipitation of $Fe{\left( {OH} \right)_2}$ ? The ${K_{sp}}$ of $Fe{\left( {OH} \right)_2}$ is $1.5 \times {10^{ – 15}}$. Molecular mass of $Fe{\left( {OH} \right)_2}$ is $ 152$ $g$ $mol^{-1}$ )

medium

$150\, mL$ of $0.0008\, M$ ammonium sulphate is mixed with $50\, mL$ of $0.04\, M$ calcium nitrate. The ionic product of $CaSO_4$ will be ($K_{SP}= 2.4\times10^{-5}$ for $CaSO_4$)

medium

Solubility of $16 \times {10^{ – 4}}\,m/s$ at ${20\,^o}C$ is $1.435 \times {10^{ – 3}}\,gm\,per\,litre$. The solubility product of $AgCl$ is

medium

(AIPMT-2002)

The $2.901$ $L$ saturated solution is formed by $0.08$ $g$ $Ca{F_2}$ at $298$ $K$ temp. then calculate ${K_{sp}}$

( Molecular moles of $Ca{F_2}$ is $78$ $g$ $mol^{-1}$ )

medium

Which of the following compound will not dissolve in hot mixture of $NaOH$ and $H_2O$ ?

Solution

Similar Questions

What is the solubility of calcium fluoride in a saturated solution, if its solubility product is $3.2 \times {10^{ – 11}}$

$150\, mL$ of $0.0008\, M$ ammonium sulphate is mixed with $50\, mL$ of $0.04\, M$ calcium nitrate. The ionic product of $CaSO_4$ will be ($K_{SP}= 2.4\times10^{-5}$ for $CaSO_4$)

Solubility of $16 \times {10^{ – 4}}\,m/s$ at ${20\,^o}C$ is $1.435 \times {10^{ – 3}}\,gm\,per\,litre$. The solubility product of $AgCl$ is

The $2.901$ $L$ saturated solution is formed by $0.08$ $g$ $Ca{F_2}$ at $298$ $K$ temp. then calculate ${K_{sp}}$ ( Molecular moles of $Ca{F_2}$ is $78$ $g$ $mol^{-1}$ )

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The $2.901$ $L$ saturated solution is formed by $0.08$ $g$ $Ca{F_2}$ at $298$ $K$ temp. then calculate ${K_{sp}}$

( Molecular moles of $Ca{F_2}$ is $78$ $g$ $mol^{-1}$ )