Alkalis give a (a)   (滑的) feel.

Some of the alkalis have a (a)   taste.

Soft drink is (a)   .

Noodle is (a)   .

Name an acidic fruit.

(a)  

Vinegar is (a)   .

Baking soda is (a)   .

Name a common acid in our laboratory.

(a)  

Name a common alkali in our laboratory.

(a)