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What is the difference between molality and molarity? - Chemistry

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प्रश्न

What is the difference between molality and molarity?

Differentiate between molarity and molality.

फरक स्पष्ट करा
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उत्तर

Sr. No. Molarity Molality
1. Molarity is the concentration of a material determined as the number of moles of solute dissolved in one litre of solution. Molality is the concentration calculated as the number of moles of solute found in one kilogram of solvent.
2. Molarity is denoted by the symbol M. Molality is denoted by the symbol m.
3. The molarity formula is moles per litre. The molality formula is moles per kilogram.
4. Molarity is impacted by temperature changes. Molality is not affected by temperature changes.
5. Changes in pressure affect molarity. Pressure changes do not affect molality.
6. Molarity can lead to an imprecise and inaccurate concentration. Molality can lead to an accurate and precise concentration measurement.
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पाठ 1: Some Basic Concepts of Chemistry - Multiple Choice Questions (Type - I) [पृष्ठ ५]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 11
पाठ 1 Some Basic Concepts of Chemistry
Multiple Choice Questions (Type - I) | Q 26 | पृष्ठ ५

संबंधित प्रश्‍न

Explain the term Saturated solution giving examples.


What is the concentration of sugar (C12H22O11) in mol L–1 if its 20 g are dissolved in enough water to make a final volume up to 2 L?


To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.


A solution contains 40 g of common salt in 320 g of water. Calculate the concentration in terms of mass by the mass percentage of the solution.

Solve the following problem:

Find out the molar mass of the following compounds:

Sodium carbonate, decahydrate (Na2CO3.10H2O)

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)


Solve the following problem:

Write the following number in ordinary decimal form:

5.00858585


Solve the following problem:

Perform the following calculation. Round off your answer to two digits.

`33/(9.00xx10^-4)`


Solve the following problem:

Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:

12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.

Give your reason for rejecting each of the others.


Solve the following problem:

What weight of calcium oxide will be formed on heating 19.3 g of calcium carbonate?
(At. wt.: Ca = 40; C = 12; O = 16)


Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture

Two immiscible liquids.


When light is passed through water containing a few drops of milk, it shows a bluish tinge. This is due to the ______ of light by milk and the phenomenon is called ______. This indicates that milk is a ______ solution.


A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in Fig.2.3. The filter paper was removed when the water moved near the top of the filter paper.

(i) What would you expect to see, if the ink contains three different coloured components?

(ii) Name the technique used by the child.

(iii) Suggest one more application of this technique.


Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100g of water?


What will be the molarity of a solution, which contains 5.85 g of NaCl(s) per 500 mL?


What will be the molality of the solution containing 18.25 g of \[\ce{HCl}\] gas in 500 g of water?


Sulphuric acid reacts with sodium hydroxide as follows:

\[\ce{H2SO4 + 2NaOH -> Na2SO4 + 2H2O}\]

When 1 L of 0.1 M sulphuric acid solution is allowed to react with 1 L of 0.1 M sodium hydroxide solution, the amount of sodium sulphate formed and its molarity in the solution obtained is:

(i) 0.1 mol L–1

(ii) 7.10 g

(iii) 0.025 mol L–1

(iv) 3.55 g


250 g solution of D-glucose in water contains 10.8% of carbon by weight. The molality of the solution is nearest to ______.

(Given: Atomic weights are H, 1u; C, 12u; O, 16u)


Molarity of liquid HCl will be if the density of the solution is 1.17 g/cc.


The molarity of urea (molar mass 60 g mol−1) solution by dissolving 15 g of urea in 500 cm3 of water is ______.


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