Similarities Between Hydrogen Tartrate And Sodium Bicarbonate

In observation, both Potassium hydrogen tartrate and Sodium bicarbonate looked identical and when touching both substances they felt the same. If the reaction by combining Potassium hydrogen tartrate, Sodium bicarbonate, and water produces an exothermic reaction, then when these three items are mixed together in a bag, one of the byproducts of this reaction will be that no heat reaction. The reason why it was exothermic because it When the 2 chemicals mixed together with water it made a sizzling noise and had bubbled like a carbonated drink and it produced gas as well.
By adding water to Sodium bicarbonate raises the temperature slightly. Sodium bicarbonate and water are exothermic therefore the water gets a little warmer. This is because