In an experiment, 132 grams of potassium bromide was dissolved in 100 grams of water at 70°C in 1 minute. Which of the following will most likely happen if the sample of potassium phosphate is dissolved in 100 grams of water at 20°C?
1) the number of collisions between particles will increase
2) the number of collisions between particles will remain constant
3) a greater number of particles of the sample will dissolve in 1 minute
4) a fewer number of particles of the sample will dissolve in 1 minute

Question

11-12-2018
Chemistry

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In an experiment, 132 grams of potassium bromide was dissolved in 100 grams of water at 70°C in 1 minute. Which of the following will most likely happen if the sample of potassium phosphate is dissolved in 100 grams of water at 20°C?
1) the number of collisions between particles will increase
2) the number of collisions between particles will remain constant
3) a greater number of particles of the sample will dissolve in 1 minute
4) a fewer number of particles of the sample will dissolve in 1 minute

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Larus Larus · Answer 1 · 2018-12-13T02:34:22+01:00

The correct answer is option 4, that is, a fewer number of particles of the sample will dissolve in 1 minute.

This is mainly because usually the solubility and the rate of solubility of the salts in water enhances with the increase in temperature, that is, the more the temperature, the faster and higher will be the number of particles that the water can dissolve. Therefore, at 70 degree Celsius more particles will get dissolved in water in 1 minute than at 20 degree Celsius.