Question

A student determined the solubility of four substances :- Potassium Nitrate , Sodium Chloride , Potassium Chloride , Ammonium Chloride in water at five different temperatures of 10°C, 20°C , 40°C , 60°C , 80°C and obtained the following data :-

Note :- Picture is in table.

Question :-

What mass of Potassium Nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at 10°C?

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Answer 1

Given that:

• Solubility of potassium nitrate at 10° C is 21 g. (Given in picture)

To Find:

• What mass of Potassium Nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at 10°C?

According to the question.

• 100 g of water contains, potassium nitrate = 21 g

Using unitary method.

• 1 g of water contains, potassium nitrate = 21/100 g
• 50 g of water contains, potassium nitrate = (21 × 50)/100 = 10.5 g

Hence,

• 10.5 g of Potassium Nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at 10°C.

Answer 2

Answer:

Question :-

$\mapsto$ What mass of Potassium Nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at 10°C ?

Given :-

$\mapsto$ The solubility of potassium nitrate at 10°C is 21 grams.

To Find :-

$\mapsto$ What mass of Potassium Nitrate would be needed to make a saturated solution ?

Solution :-

$\bigstar$ The solubility of potassium nitrate at 10°C is 21 g.

So, it's means 21 g of potassium nitrate is needed to make a saturated solution.

And, in this potassium nitrate the water contains is 100 g.

$\leadsto$ A saturated solution of potassium nitrate in 50 grams of water at 10°C.

So, according to the question,

➸ If 1 g of potassium nitrate at 10°C is

$\implies \sf \dfrac{21}{100}$

➸ So, 50 g of potassium nitrate at 10°C will be,

$\implies \sf \dfrac{21 \times 50}{100}$

$\implies \sf \dfrac{105\cancel{0}}{10\cancel{0}}$

$\implies \sf \dfrac{105}{10}$

$\implies \sf\bold{\red{10.5\: g}}$

$\therefore$ The mass of Potassium Nitrate would be needed to make a saturated solution of potassium nitrate in 50 grams of water at 10°C is 10.5 grams .

EXTRA INFORMATION :

❒ Saturated Solution :

• A solution which cannot dissolve any more quantity of a given substance in it, it is said as saturated solution.

❒ Unsaturated Solution :

• A solution which can dissolve more quantity of a given substance in it, it is said as unsaturated solution.