CBSE Guess > Papers > Important Questions > Class XII > 2013 > Chemistry > I- Concentration of solutions By Mr. R. Srinivas Vasudevamurthy
CBSE CLASS XII
Concentration of solutions (Numerical)
1. A sample of drinking water contains 15 ppm of CHCl3 (by mass) Express this in % mass.Also find out the molality of the solution.
2. Concentrated H2SO4 is 49% by mass. Density of the solution is 1.5 g/ cm3. Determine the molality and molarity of the solution.(Molar mass of H2SO4 = 98)
3. Concentated HNO3 is 68% by mass. Density of the solution is 1.5 g/ cm3. Calculate the volume of the solution containing 20 grams of HNO3.
4. Na2CO3 and NaHCO3 mixture containing 1 gram is completely neutralised by 0.1 M HCl. Determine the volume of HCl needed if the mixture contains equimolar mixture of Na2CO3 and NaHCO3.
5. Calulate the molality of 1M solution of NaNO3.Density of solution is 1.25 g/ cm3. Molar mass of NaNO3 = 85.
6. Calculate the number of moles of CH3OH in 5 litres of 2 molal solution. Density of the solution is 0.981 g/ cm3
7. Calculate the molality , molarity and mole fraction of KI if the density of 20% (mass/mass) aqueous solution of KI is 1.2 g/ cm3
8. If the solubility product of CuS is 6x10-6. Calculate the maximum molarity of CuS in aqueous solution.
9. Calculate the volume of 80% H2SO4 (D=1.8 g/ cm3) needed to prepare 1 litre of 20% H2SO4 (D=1.25 g/cm3.)
10. If the density of lake water is 1.25 g/ cm3 and contains 92 grams of Na+ ion per Kg of water, determine the molality of Na+ ion in solution.
Submitted By : Mr. R. Srinivas Vasudevamurthy
Email: [email protected]
