Bridget is in science class. Her teacher gives her two unknown substances and asks her to determine their relative pH. She place
s a piece of red litmus paper into both substances. The litmus paper turns purple when she places it into substance I. The litmus paper turns blue when she places it into substance II. Which of the following is true about the relative pH of the two substances? A. Substance I is a base and substance II is a neutral substance. B. Substance I is an acid and substance II is a base. C. Substance I is a neutral substance and substance II is a base. D. Substance I is a neutral substance and substance II is an acid.
Litmus paper is often used to determine the range of pH of an aqueous solution. Litmus paper specifically contains 10-15 natural dyes, in the presence of acidic solution it turns red, it turns purple when the solution is neutral and blue when dealing with basic solutions. Red litmus paper stays red for a neutral and acidic solution but changes to blue in the presence of alkaline solutions. On the other hand, blue litmus paper turns red when a solution is acidic but stays blue for neutral and alkaline solutions. Since the paper turns purple in the presence of solution 1 we know that is neutral, meanwhile, since it turns blue for the second solution we know that solution II is a base correct answer is C
