the pH indicator broadcloth blue is blue in alkaline solution and yellow in an acidity, such as when CO2 gas is added to a solution , causes a solution with the indicator to change from blue to yellow ? a solution with the indicator would turn from yellow to blue when which combinations of factors exists? select the two correct answers. A. a person blows air into the solution through a straw. B. A water plant in the solution is placed on a sunny windowless. C. algae in the solution are placed under a bright light. D. yeast cells and sugar are placed in the solution