Recent questions tagged equilibrium

State True or False$S_1$ : Third group of periodic table accommodates maximum number of elements. $S_2$ : Due to presence of half filled and fully filled sub shells in electronic configuration electronegativity of atom increases. $S_3$ : The element of 13th group and 7th period will have atomic number 113. $S_4$ : diagonal relationship in 2nd and 3rd period element is found due to similar charge to size ratio.

asked Jan 18, 2016 by meena.p

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The $pK_a$ of weak acid (HA) is 4.5 . The $pOH$ of an aqueous buffered solution of HA in which 50% of acid is ionized is

asked Nov 27, 2013 by mosymeow_1

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Which of the following ionic species has the greatest protons affinity to form stable compound?

asked Nov 27, 2013 by mosymeow_1

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The solubility of $A_2X_3$ is y mol $dm^{-3}$. Its solubility product is

asked Nov 27, 2013 by mosymeow_1

1 answer

When $0.1\; mol$ of $CH_3NH_2$ (ionisation constant, $K_b = 5 \times 10^{-4}$) is mixed with $0.08\;mol\; HCl$ and the volume is made up to $1\; L$ find the [$H^+$] of resulting solution,

asked Nov 27, 2013 by mosymeow_1

1 answer

$H_3BO_3$ is

asked Nov 27, 2013 by mosymeow_1

2 answers

The $pH$ of $\frac{M}{100}$ NaOH solution is:

asked Nov 27, 2013 by mosymeow_1

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Ammonium acetate which is 0.01 M, is hydrolysed to 0.001 M concentration. Calculate the change in $pH$ in 0.001 M solution, if initially $pH = pK_a$

asked Nov 27, 2013 by mosymeow_1

1 answer

When solid lead iodide is added to water, the equilibrium concentration of $I^-$ becomes $2.6 \times 10^{-3}$M. What is the $K_{sp}$ for $PbI_2$

asked Nov 27, 2013 by mosymeow_1

1 answer

For a concentrated solution of a weak electrolytic $A_xB_y$ of concentration C, the degree of dissociation $\alpha$ is given by

asked Nov 27, 2013 by mosymeow_1

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A solution has $pH$ = 5 is to be diluted 100 times then it will become

asked Nov 27, 2013 by mosymeow_1

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$K_{sp}$ of $Mg(OH)_2$ is $1 \times 10^{-12}$, 0.01 M $Mg^{+}$ will precipitate at the limiting $pH$ of

asked Nov 27, 2013 by mosymeow_1

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Equal volume of the follwing $Ca^{2+}$ and $F^-$ solutions are mixed. In which of the follwing solutions will precipitation occur?

asked Nov 27, 2013 by mosymeow_1

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What is the correct relationship between the $pH$s of isomolar solutions of sodium oxide ($pH_1$), sodium sulphide ($pH_2$), sodium selenide ($pH_3$) and sodium telluride ($pH_4$)?

asked Nov 27, 2013 by mosymeow_1

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The rapid change of $pH$ near the stoichiometric point of an acid-base titration is the basis of indicator detection. $pH$ of the solution is related to ratio of the concentration of the conjugated acid(HIn) and base (In) form of the indicator by the expression

asked Nov 27, 2013 by mosymeow_1

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The $pH$ value of gastric juice in human stomach is about 1.8 and in the small intestine it is about 7.8. The $pK_a$ value of aspirin is 3.5. Aspirin will be

asked Nov 27, 2013 by mosymeow_1

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If equilibrium constant of the reaction of weak acid $HA$ with $NaOH$ is $10^9$, then $pH$ of $0.1\; M\; NaA$ is

asked Nov 27, 2013 by mosymeow_1

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If freezing point of 0.1 M aqueous weak monobasic acid is $-0.2046^\circ C$, then $pH$ of solution is [$K_f (H_2O) = 1.86 kg mol^{-1}$]

asked Nov 27, 2013 by mosymeow_1

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$pH$ of a mixture of 1 M benzoic acid ($pK_a$ = 4.20) and 1 M solution benzoate is 4.5. In 300 mL of buffer solution, volume of benzoic acid solution is

asked Nov 27, 2013 by mosymeow_1

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Percentage ionisation of a weak monobasic acid can be calculated by using the formula

asked Nov 27, 2013 by mosymeow_1

2 answers

To prepare a buffer of $pH$ 8.26 amount of $(NH_4)_2SO_4$ to be added into 50 mL of 0.01 M $NH_4OH$ solution is [$pK_a (NH_4^+)$ = 9.26]

asked Nov 27, 2013 by mosymeow_1

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Assuming 100% ionization in case of strong electrolytes which of the following will have minimum $pH$?

asked Nov 27, 2013 by mosymeow_1

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$pH$ of $Ca(OH)_2$ solution is 12. Millimoles of ($Ca(OH)_2$) present in 100 mL of solution will be

asked Nov 27, 2013 by mosymeow_1

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Both $HCOOH$ and $CH_3COOH$ solutions have equal $pH$. If $\frac{K_1}{K_2}$ (ratio of acid ionisation constants) of these acids is 4, their molar concentration ratio will be

asked Nov 27, 2013 by mosymeow_1

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For the reaction $S_2O_3^{2-} (aq) + 2H_3O^+ (aq) \rightleftharpoons S (s) + H_2SO_3 (aq) + H_2O(l)$; Rate = $k [H_3O^+][S_2O_3^{2-}]$. Reaction is fastest in

asked Nov 27, 2013 by mosymeow_1

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Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water?

asked Nov 27, 2013 by mosymeow_1

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Which of the following solutions will have $pH$ of 4.74?

asked Nov 27, 2013 by mosymeow_1

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BOH is a weak base. Molar concentration of BOH provides a [OH^-] of $1.5 \times 10^{-3}$ M is [Given $K_b$ (BOH) = $1.5 \times 10^{-3}$]

asked Nov 27, 2013 by mosymeow_1

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100 mL of $pH$ =6 solution is diluted to 100 mL by water. $pH$ of the solution will increase by

asked Nov 27, 2013 by mosymeow_1

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$pH$ of 0.01 M $(NH_4)_2SO_4$ and 0.02 M $NH_4OH$ buffer ($pK_a$ of $NH_4^+$ = 9.26) is

asked Nov 27, 2013 by mosymeow_1

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A weak base, B has basicity constant, $K_b = 2 \times 10^{-5}$. The $pH$ of any solution in which $[B] = [BH^+]$ is

asked Nov 27, 2013 by mosymeow_1

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$pH$ at which an acidic indicator with $K_{in} = 1 \times 10^{-5}$ changes colour when the indicator is $1 \times 10^{-3}$ M is

asked Nov 27, 2013 by mosymeow_1

1 answer

$pH$ of the solution containing 50.0 mL of 0.3 M HCl and 50.0 mL of 0.4 M $NH_3$ is

asked Nov 27, 2013 by mosymeow_1

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$pK_{a1}, pK_{a2}$ and $pK_{a3}$ of $H_3PO_4$ are respectively x, y and z. $pH$ of 0.1 M $Na_2HPO_4$ solution is

asked Nov 27, 2013 by mosymeow_1

1 answer

$pK_{a1}$ and $pK_{a2}$ of $H_2CO_3$ are 6.38 and 10.26 respectively. The $pH$ of 1 M and 0.1 M $NaHCO_3$ are

asked Nov 27, 2013 by mosymeow_1

1 answer

Hydrolysis constant of $NH^+_4$ is $5.55 \times 10^{-10}$. The ionisation constant of $NH^+_4$ is

asked Nov 27, 2013 by mosymeow_1

1 answer

$pK_b$ of $NH_3$ is 4.74. The $pH$ when 100 mL of 0.01 M $NH_3$ solution is 50% neutralised by 0.01 M HCl is,

asked Nov 27, 2013 by mosymeow_1

1 answer

$K_a$ for HCN is $5 \times 10^{-10}$ at $25^\circ C$. How much volume of 5 M KCN solution is required to be added to 10 mL of 2 M HCN in order to maintain $pH$ = 9

asked Nov 27, 2013 by mosymeow_1

1 answer

The hydronium ion concentration in pure water is $1 \times 10^{-7}$ mol$L^{-1}$. The degree of dissociation of water is

asked Nov 27, 2013 by mosymeow_1

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The dissociation constant of $H_2S$ and $HS^-$ are respectively $10^{-7}$ and $10^{-13}$. The $pH$ of 0.1 M aqueous solution of $H_2S$ will be

asked Nov 27, 2013 by mosymeow_1

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To 10 mL of aqueous solution some strong acid having $pH$ = 2 is mixed with $pH$ = 4.0. The $pH$ of resulting solution is

asked Nov 27, 2013 by mosymeow_1

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The dissociation constant of certain weak acid HA is $1 \times 10^{-4}$. The equilibrium constant for its reaction with strong base BOH is

asked Nov 27, 2013 by mosymeow_1

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The $pH$ of 0.1 M solution of $NH_4OH$ (having dissociation constant $K_b = 1.0 \times 10^{-5})$ is equal to

asked Nov 27, 2013 by mosymeow_1

1 answer

A solution was prepared by dissolving 0.0005 mol of $Ba(OH)_2$ in 100 mL of the solution. If the base is assumed to ionise completely, the $pOH$ of the solution will be

asked Nov 27, 2013 by mosymeow_1

1 answer

The $pH$ of a solution is 5.00. To this solution, sufficient acid is added to lower the $pH$ to 2.00. The corresponding increase in $H_3O^+$ ion concentration is

asked Nov 27, 2013 by mosymeow_1

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$M_2SO_4$ ($M^+$ is monovalent metal ion) has a $K_{sp}$ of $3.2 \times 10^{-5}$ at 298 K. The maximum concentration of $SO^{2-}_4$ ion that could be attained in a saturated solution of this solid at 289 K is

asked Nov 27, 2013 by mosymeow_1

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The value of $K^{sp}$ of $HgCl_2$ at room temperature is $4 \times 10^{-15}$. The concentration of $Cl^-$ ion in its aqueous solution at saturation point is

asked Nov 27, 2013 by mosymeow_1

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The dissociation constants of two acids $HA_1$ and $HA_2$ are $3.0 \times 10^{-4}$ and $1.8 \times 10^{-5}$ respectively. The relative strengths of the acids will be

asked Nov 27, 2013 by mosymeow_1

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At a certain temperature, dissociation constant of formic acid and acetic acid are $1.8 \times 10^{-4}$ and $1.8 \times 10^{-5}$ respectively. At what concentration of acetic solution, the $H_3O^+$ ion concentration is same as that in 0.001 M fromic acid solution

asked Nov 27, 2013 by mosymeow_1

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The dissociation constants of four monobasic acids HA, HX, HY and HD are respectively $6 \times 10^{-4}, 5 \times 10^{-5}, 3.6 \times 10^{-6}, 7 \times 10^{-10}$. The $pH$ values of their 0.1 M aqueous solutions is

asked Nov 27, 2013 by mosymeow_1

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