Acids and Bases in our Bodies Our use hydrochloric acid to help digest foods.
It also kills and helps to keep us from getting sick.
Our produces lactic acid when we exercise.
Our uses a base to help with digestion

Svante Arrhenius
Chemist who devised a way to define acids and bases in 1887.
Believed that acids were substances that produce ions
In solution.
Bases were substances that produced ions in solution.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt