Solve this: 92. The solubility of CaCO_{3} in water is 3.05 x 10^{-4} moles/litre. Its solubility product will be : (a) 6.1 x 10^{4} (b) 9.3 (c) 3.05 x 10^{-4} (d) 9.3 x 10^{-8}

Li or Cs ?

Please provide one answer and why?

Thankyou.

$Z{n}_{\left(s\right)}+C{u}_{\left(aq\right)}^{2+}\rightleftharpoons Z{n}_{\left(aq\right)}^{2+}+C{u}_{\left(s\right)}$ .

What will be potential of the cell at $25\xb0C$ if the concentration of $Z{n}^{2+}andC{u}^{2+}$ ions each is 0.1 M?

A) 1.10 B) 0.10 C) -1.10 D) -0.10

101. The mass in grams of copper will be deposited from a solution of Cu

^{2+}by a current of 2.50 A in 2 hours, is(a) 23 7

(b) 0.187

(c) 1.65

(d) 5 93

$\mathbf{97}\mathbf{.}Alitreofsolutioncontaining0.1moleofC{H}_{3}COOHand0.1moleofC{H}_{3}COONaprovideabufferofpH4.74.CalculatethepHofthesolutionaftertheadditionof0.02moleofNaOH.Ka=1.8\times {10}^{-5}\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(a\right)4.92\phantom{\rule{0ex}{0ex}}\left(b\right)4.03\phantom{\rule{0ex}{0ex}}\left(c\right)8.56\phantom{\rule{0ex}{0ex}}\left(d\right)5.32$

Solve this:92. The solubility of CaCO

_{3}in water is 3.05 x 10^{-4}moles/litre. Its solubility product will be :(a) 6.1 x 10

^{4}(b) 9.3

(c) 3.05 x 10

^{-4}(d) 9.3 x 10

^{-8}_{4}and AgNO_{3}are connected in series. Current of 2 A was passed till 10.8 g of Ag got deposited. (At. wt. of Cu = 63, Ag = 108). The amount of Cu deposited in the same time will be?$47.CalculatetheK.E.ofamoleculeofC{O}_{2}at100C\left(R=8.314Jmo{l}^{-1}{K}^{-},Avogadro\text{'}snumber=6.023\times {10}^{23}\right)\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}\left(a\right)5.65\times {10}^{-21}JMolecul{e}^{-1}\phantom{\rule{0ex}{0ex}}\left(b\right)6.79\times {10}^{-20}JMolecul{e}^{-1}\phantom{\rule{0ex}{0ex}}\left(c\right)8.98\times {10}^{-21}JMolecul{e}^{-1}\phantom{\rule{0ex}{0ex}}\left(d\right)6.21\times {10}^{-20}JMolecul{e}^{-1}$

(pkw+pka+ logc)/2

or (pkw-pka-log c )/2

or (pkw+pka- logc)/2

Q. What is the pH at equivalence point in the titration of 0.1 MCH

_{3}COOH and 0.1 M NaOH?(K

_{a}for acetic acid is 1.8 × 10^{–5})(a) 7

(b) Between 7 and 8

(c) Between 8 and 9

(d) Between 6 and 7

$\mathbf{sol}\mathbf{.}\mathbf{\left(}\mathbf{c}\mathbf{\right)}\mathbf{}\mathbf{}\mathbf{}\mathrm{For}\mathrm{weak}\mathrm{acid}\mathrm{and}\mathrm{strong}\mathrm{base},\phantom{\rule{0ex}{0ex}}\mathrm{pH}=7+\frac{1}{2}{\mathrm{pK}}_{\mathrm{a}}+\frac{1}{2}\mathrm{logC}\phantom{\rule{0ex}{0ex}}=7+\frac{4.74}{2}+\frac{1}{2}\mathrm{log}{10}^{-1}\phantom{\rule{0ex}{0ex}}=8.87$