Salim added 1 g of salt to each of four beakers filled with water. He stirred the water at different speeds, and recorded how long it took for the salt to dissolved.

Stirring Time (sec)
No stirring 25
Slow stirring 18
Medium stirring 10
Fast stirring 6

Which conclusion should Salim draw?

a) Salt will not dissolve in water unless the water is stirred.
b) Stirring water increases the rate at which a salt dissolves.
c) Stirring water decreases the rate at which a salt dissolves.
d) Stirring has no effect on the rate at which a salt dissolves.

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To find the conclusion, we need to analyze the data provided. The time it took for the salt to dissolve is recorded for four different stirring speeds.

If we compare the time taken for the salt to dissolve without stirring (25 seconds) to the times taken with each stirring speed, we can see that the time decreases as the stirring speed increases.

This indicates that stirring the water increases the rate at which the salt dissolves.

Therefore, the conclusion Salim should draw is:

b) Stirring water increases the rate at which a salt dissolves.