Sam & Heather are studying the reaction between vinegar and baking soda. They already know that when vinegar and baking soda are mixed, a vigorous reaction produces a lot of bubbles and that the baking soda seems to disappear during the reaction. During a class discussion, the students figured out that the equation for the reaction is:
Sam and Heather measure 50 ml of vinegar and pour it into a flask. Then they weigh out 10 g of powdered baking soda. Sam starts the stopwatch when Heather dumps the baking soda into the flask, then Heather gently swirls the flask while Sam watches to see when the last bubbles are given off by the reaction. They have determined that the reaction takes 30 seconds under these conditions.
16. A solid lump of baking soda weighing 10 g is used in place of the 10 g of powdered baking soda. The change will:
a) decrease the reaction time, and the bubbles will stop in less than 30 seconds.
b) increase the reaction time and the bubbles will continue for more than 30 seconds. Because the baking soda is now solid, it takes longer for the vinegar to react with all the baking soda molecules!
c) have NO effect on the speed of the reaction and the bubbles will stop in 30 seconds.
d) be impossible to be predicted, given this information.
