A) 11
B) 9
C) 5
D) 10
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The correct answer is option C) 5
A solution that turns blue litmus red is likely to be acidic, with a pH of less than 7. The pH scale ranges from 0 to 14, with 7 being neutral. Acids have a pH of less than 7 and bases have a pH greater than 7. Blue litmus paper changes color to red when it comes into contact with an acidic solution, indicating that the solution has a pH of less than 7.
A) 11 – pH 11 would be considered a very basic solution with a pH greater than 7. Blue litmus paper changes color to red when it comes into contact with an acidic solution, so this would not be the correct option.
B) 9 – pH 9 would be considered a basic solution with a pH greater than 7 but less than 11, so this would not be the correct option.
C) 5 – pH 5 would be considered an acidic solution with a pH less than 7. As a solution that turns blue litmus red is likely to be acidic, this would be the correct option.
D) 10 – pH 10 would be considered a basic solution with a pH greater than 7 but less than 11, so this would not be the correct option.