Phenol Red Solution Lab Report

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To start off, we initially placed 10g of calcium chloride, 12g of sodium bicarbonate, and 20 mL of phenol red solution into a ziploc bag in separate locations without letting the substances make contact. We then sealed the bag, squeezing out as much air as possible, and let the substances mix together while recording observations. Six different groups within the classroom then proceeded to do the experiment again but with varying substances and quantities. The control experiments were conducted with the same procedure, with these six combinations of substances: 10g of calcium chloride with 20mL of phenol red solution, 10g of calcium chloride with 8mL of phenol red solution, 12g of sodium bicarbonate with 20mL of phenol red solution, 10g of…show more content…
The control experiments that were recorded to have resulted in exothermic temperature changes were 10g of calcium chloride with 20mL of phenol red solution, 10g of calcium chloride with 8mL of phenol red solution, and 10g of calcium chloride with 20mL of water. All of these combinations of substances contained water and calcium chloride, while two of them also included phenol red in a solution containing the water. There was no difference in released heat from the 10g of calcium chloride with 20mL of phenol red solution or from the 10g of calcium chloride with 20mL of water. Both highly resembled the change in temperature that occurred in the initial setup. This shows that the phenol red held no responsibility in causing the observed change of temperature, because the two mixtures just discussed contained no differences in the amounts of phenol red solution compared to just water. All variables remained constant, besides the switch of phenol red solution with water. Although other combinations also produced a temperature change, these other combinations’ reactions were endothermic, rather than exothermic. The initial setup was an exothermic change, so the control reactions that were endothermic could not be held responsible for the change in temperature. This change in temperature is a chemical change. The released energy in the form of heat shows that this
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