students investigated what happens when citric acid combines with baking soda in water. they followed these steps: place a thermometer in a beaker of room-temperature water. add baking soda to the beaker of water and stir until the baking soda is no longer visible. add citric acid to the beaker and stir for 5 sec. the students recorded observations in a lab notebook every 30 sec for 2 min. they made the following observations: the temperature decreased. bubbles formed. the color did not change.