Question

Alkalis have a pH above 7.0 and turn litmus paper from red to blue. They feel slippery and soapy on the skin.

Answer 1

Answer: TRUE.

Explanation: Alkalis are one of a class of caustic bases, such as soda, soda ash, caustic soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with OILS AND FATS TO FORM SOAP, neutralizing and forming salts with acids, HAVE A pH ABOVE 7 turning to brown several vegetable yellows, and changing REDDENED LITMUS TO BLUE.

Answer 2

The answer is true due to the saponification of the fatty substances on the surface of the skin.