A 1 gram of salt in 1 m3 of solution hasconcentration of 1 ppm.ppm is defined as number of parts by mass ofsolute per million parts of solution.

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Q. Units of parts per million (ppm) or parts per billion (ppb) are often used to describe the concentrations of solutes in very dilute solutions. The units are defined as the number of grams of solute per million or per billion grams of solvent. Bay of Bengal has

1.89

ppm of lithium ions. The molality of

L i^{+}

in this water is (atomic number of

L i = 7

Question 01
Which of the following units is useful in relating concentration of solution with its vapour pressure?
(a) Mole fraction (b) Parts per million
(c) Mass percentage (d) Molality

Q. A solution contains 40 grams of common salt dissolved in 345 grams the solution. Calculate the concentration percentage of the solution by mass percentage.

Q. Rajat took 100 g of 50% (w/w) sugar solution. He divided the solution into 4 equal parts. He added
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1^{s t}

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Q. (a) Define the following terms:
(i) Molarity (ii) Molal elevation constant

(k_{b})

(b) A solution containing

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urea (molar mass

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