Ways to Define Concentration

Q.

How can we prepare $0.1$ N HCl solution?

Q.

What is the concentration in terms of mass percent of a solution in which 40 g of salt is dissolved in 200 mL of water?

1. 20 %

2. 16.66 %

3. 25.0 %

4. 12.5 %

Q.

What do you mean by decinormal solution?

Q.

${\mathrm{PbI}}_2$ has a solubility product of $8.0\times {10}^{-9}$. Lead Iodide has a solubility in $0.1\mathrm{molar}$ Lead Nitrate is $\mathrm{x}\times {10}^{-6}\mathrm{mol}/\mathrm{L}$. What is the value of $\mathrm{X}$? (Round off to the nearest integer)

Q. A solution contains sugar dissolved in 150 g of water. If the mass of the solution is 200 g, calculate the concentration in terms of the mass by mass percentage of the solution.

1. 10%
2. 50%
3. 25%
4. 75%

Q.

The hydrogen ion concentration in an acidic solution is ${10}^{-5}$. What is the pH value of the solution?

Q.

The teacher instructed three studentsA, B andC respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH).A dissolved 50g of $\mathrm{NaOH}$ in 100 mL of water, B dissolved 50g of $\mathrm{NaOH}$ in 100g of water whileC dissolved 50g of $\mathrm{NaOH}$ in water to make mL of solution. Which one of them has made the desired solution?

Q.

Define Concentration of solution

Q. The vapour pressure of chloroform $\left({CHCl}_3\right)$ and dichloromethane $\left({CH}_2{Cl}_2\right)$ at 298 K is 200 mm Hg and 415 mm Hg, respectively. If a solution is prepared by mixing 25.5 g of ${CHCl}_3$ and 40 g of ${CH}_2{Cl}_2$ at 298 K, calculate the mole fractions of chloroform in vapour phase.

1. $0.18$
2. $0.82$
3. $0.34$
4. $0.48$

Q. A solution is prepared by dissolving 10 g of salt in 100 g of water. Calculate the mass percentage of the solution.

1. 9.09

Q.

To make a saturated solution, 30 grams of sodium chloride is dissolved in 100 grams of water at 293K. Find its concentration (mass by mass percentage) at this temperature.

1. 24.08 %

2. 22.67%

3. 21.00 %

4. 23.07 %

Q. A solution contains 50 mL of ethyl alcohol in 450 mL of water. Calculate the concentration of the solution in terms of volume by volume percentage.

1. 10

Q. The solubility of potassium chloride at ${20}^{\circ }C$ is 34.7 g in 100 g of water. The density of the solution is 1.3 g $m{L}^1$. What is the w/V percentage of potassium chloride in the solution ?

1. 25.76
2. 32.98
3. 33.49
4. 22.56

Q.

At CMC, the surfactant molecules:

1. Decompose

2. Become completely soluble

3. Associate

4. Dissociate

Q.

What are the various methods to express concentration of a solution? [2 MARKS]

Q. A sample of drinking water was found to be severely contaminated with chloroform supposed to be carcinogenic in nature the level of contamination was 15ppm (by Mass). Determined the moality of chloroform in water sample

Q. 5 kg of water sample contains 0.2 g of fluoride. Calculate the concentration of fluoride ions in terms of ppm.

1. 4000
2. 200
3. 400
4. 40

Q.

Fingerprints Detection by Sprinkling Fluorescent Powder

1. Sunlight

2. Dark light

3. Infrared light

4. Ultraviolet light

Q. Define molarity and molality and explain its difference?

Q. $40$g MgO dissolves in $H_{2}O$ to form $200$ ml of solution, if density of solution is $1.5$g/ml.

Q.

Complete and balance the equations:
${\mathrm{Mg}}_3{\mathrm{N}}_2+6{\mathrm{H}}_2\mathrm{O}⟶$

Q.

Srivani dissolved 50 g of salt in 150 mL of water to carry out an experiment. She needs another 240 mL of the 'same' solution for another experiment. How much salt does she need to make the 'same' solution?

1. 240

2. 60

3. 80

4. 120

Q.

A solution contains 30 mL of ethyl alcohol mixed with 100 mL of water. What is the concentration of the solution in terms of volume by volume percentage?

1. 25.66 %

2. 22.00%

3. 23.00 %

4. 23.07 %

Q. Take $10g$ of common salt and dissolve it in $40g$ of water. Find the concentration of solution in terms of weight percent.

Q.

Complete and balance the following reaction.

${\mathrm{Cl}}_2+2\mathrm{NaBr}\to \mathrm{\_\_\_\_}+{\mathrm{Br}}_2\uparrow$

Q. A solution of glycerine with a concentration of 10.2 gm/ lit. and 2% solution of glucose are isotonic. Determine the molecular weight of glycerine. (Molecular weight of glucose = 180)

Q. The concentration of a solution is 8%(w/w) and 10%(w/v). Calculate density (in g/ml) of solution.

Q. Commercially available conc. HCl contains 38% HCl by mass, what is the molarity of the solution, density of solution = 1.19 g/ml. What volume of conc. HCl is required to make 10. L of an 0.10 M HCl

Q. A certain sample of cuprous sulphide is found to have composition $C{u}_{1.8}S$, because of incorporation of $C{u}^{2+}$ ions in the lattice. What is the mole $\%$ of $C{u}^{2+}$ in total copper content in this crystal?

1. $99.8\%$
2. $88.88\%$
3. $11.11\%$
4. None of these

Q. A current of dry air was passed through a solution of $2.5$ g of a non-volatile solute in $100$ g of water and through water alone. The loss in the weight of solution was $1.25$ g and that of water was $0.005$ g. Calculate the molecular mass of the solute.