Advertisements
Advertisements
Question
Define the following modes of expressing the concentration of a solution. Which of these modes are independent of temperature and why?
m (Molality)
Advertisements
Solution
The no. of moles of solute per kg of solvent
Molality (m) = `"Moles of solute"/"Mass of solvent in kg"`
Effect of temperature: Mass % ppm, mole fraction and molality do not change with temperature where as molarity, volume percentage and mass by volume percentage changes with temperature because volume of solution (liquid) varies with changes in temperature.
APPEARS IN
RELATED QUESTIONS
Define mole fraction.
If the density of some lake water is 1.25 g mL−1 and contains 92 g of Na+ ions per kg of water, calculate the molality of Na+ ions in the lake.
If the solubility product of CuS is 6 × 10−16, calculate the maximum molarity of CuS in aqueous solution.
A sample of 12 M Concentrated hydrochloric acid has a density 1.2 M gL-1 calculate the molality.
Molality of a solution relates the ____________.
The sum of all mole fraction for a mixture is always equal to ____________.
Which of the following is a quantitative description of the solution?
An X molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of X is ____________.
4.0 g of NaOH is dissolved in 100 ml solution. The normality of the solution is ____________.
An aqueous solution of glucose is 10% in strength. The volume in which 1 g mole of it is dissolved, will be:
The volume of 4 N HCl and 10 N HCl required to make 1 litre of 6 N HCl are ____________.
200 ml of water is added to 500 ml of 0.2 M solution. What is the molarity of this diluted solution?
For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be:
If N/10 50 ml H2SO4, N/3 30 ml HNO3, N/2 10 ml HCl is mixed and solution is made to 1 L. Then normality of the resultant solution is:
Mole fraction of C3H5(OH)3 in a solution of 36 g of water and 46 g of glycerine is ______.
What is the mole fraction of solute in 1.00 m aqueous solutions?
Match List-I with List-II:
| List-I | List-II |
| A. ppm | I. molL-¹ |
| B. Molarity | II. No units |
| C. Molality | III. Independent of temperature |
| D. Mole fraction | IV. Very dilute solutions |
Choose the correct answer from the options given below:
250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is ______ × 1021. (Nearest integer) (NA = 6.022 × 1023).
The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4 · 2 H2O) in 250 mL of water in mol L-1 is x × 10-2. The value of x is ______. (Nearest integer)
[Atomic mass: H : 1.0, C : 12.0, O : 16.0]
