What is stronger - acid or alkaline?

Answer:
Both an acid and an alkali can be strong or weak. These are 2 different things. A strong acid is an acid which has a low pH (pH 1 or 2 or 3) and a weak acid is an acid of pH about 5 or 6. Whereas a strong alkali is an alkali of pH 11, 12 while a weak alkali has a pH of about 7 or 8.
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