Question

Mrs. Smith is demonstrating a chemical change for her class. She places 15 grams of baking soda into a beaker. Next she adds 15 grams of vinegar to the same beaker. When the two compounds make contact, they bubble and fizz a great deal. She places the beaker on the balance and notes that the mass of the solution in the beaker is less than the expected 30 grams. Why is the mass of the solution in the beaker less than 30 grams?

Answer 1

Mrs. Smith the chemistry teacher is demonstrating an experiment in the class room.

She took 15grams of baking soda and adds it to the 15 grams of vinegar or acetic acid in a beaker (initial weight of the reactants is 15+15= 30grams).

Baking soda and vinegar reacts with each other and bubbles out the gas from the flask with a fizz sound.

After the fizzing sound is over the teacher weighs the beaker with the balance solution in it.

The contents in the beaker is less than 30 grams what she had taken initially because the gas that released is responsible for the change in mass.