What are the limitations of litmus paper and phenolphthalein indicators? Name two other indicators that can be used that do not have such limitations.

It can only detect the difference between strongly acidic and basic solutions. Litmus paper turns red below pH < 4.5 and turns blue at pH > 8.3. It cannot test changes in pH between this range which is where neutral pH is located (pH 7).

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d