Ascientist wants to test how much of an acid can be added to a solution before the ph of the solution changes to below a certain point. the starting ph of the solution is 6.0, and the scientist wants to know when the ph of the solution changes to below 5.0.

which ph indicator should the scientist use?

a. phenolphthalein, which changes from colorless to purple around a ph of 8.3
b. cresol red, which changes from yellow to purple around a ph of 7.2
c. congo red, which changes from red to violet around a ph of 5.0
d. thymolphthalein, which changes from colorless to blue around a ph

Which mathematical relationship should you us to convert moles of a substance into grams

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

In a laboratory experiment, a fermenting aqueous solution of glucose and yeast produces carbon dioxide gas and ethanol. the solution was heated by burning natural gas in a bunsen burner to distill the ethanol that formed in the flask. during the distillation, the ethanol evaporated and then condensed in the receiving flask. the flame of the burner was kept too close to the bottom of the flask and some of the glucose decomposed into a black carbon deposit on the inside of the flask. during this experiment the following changes occurred. which of these changes involved a physical change and not a chemical change? check all that apply. 1-condensation of ethanol 2-evaporation of ethanol 3- formation of carbon dioxide gas from glucose burning of natural gas 4-formation of ethanol from glucose by yeast 5-formation of a carbon deposit inside the flask