Question

In an experiment, 132 grams of potassium bromide (KNO3) 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? The number of collisions between particles will increase. The number of collisions between particles will remain constant. A greater number of particles of the sample will dissolve in 1 minute. A fewer number of particles of the sample will dissolve in 1 minute.

Answer 1

Answer: A fewer number of particles of the sample will dissolve in 1 minute

Answer 2

Answer: A fewer number of particles of the sample will dissolve in 1 minute.

That is because normally the solubility and rate of solubility of the salts in water increase with the temperature. This is, the higher the temperature the higher and faster the number of particles that the water can dissolve. So, at 70°C more particles will be dissolved in water in 1 minute than at 20°C.