Which solution contains maximum number of ${H^ + }$ ion

  • A

    $0.1\, M$  $HCl$

  • B

    $0.1 \,M$  $N{H_4}Cl$

  • C

    $0.1\, M$  $NaHC{O_3}$

  • D

    $0.1 \,M$ $Na_2C{O_3}$

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A weak acid $HA$ has a $K_a$ of $1.00 \times 10^{-5} $. If $0.100\,mol$ of this acid is dissolved in one litre of water the percentage of acid dissociated at equilibrium is closest to.....$\%$

Values of dissociation constant, $K_a$ are given as follows

      Acid       $K_a$
      $HCN$       $6.2\times 10^{-10}$
      $HF$       $7.2\times 10^{-4}$
      $HNO_2$       $4.0\times 10^{-4}$

Correct order of increasing base strength of the base $CN^-,F^-$ and $NO_2^-$ will be

  • [JEE MAIN 2013]

The degree of dissociation $(\alpha )$ of $PCl_5$ obeying the equilibrium;  is $PC{l_5}\, \rightleftharpoons \,PC{l_3}\, + \,C{l_2}$ related to the pressure at equlibrium by

What is the percent ionization $(\alpha)$ of a $0.01\, M\, HA$ solution ? .......$\%$ $(K_a = 10^{-6})$

The $pH$ of $0.1\, M$ monobasic acid is $4.50$ Calculate the concentration of species $H ^{+},$ $A^{-}$ and $HA$ at equilibrium. Also, determine the value of $K_{a}$ and $pK _{a}$ of the monobasic acid.