Someone explain this to
determining the ph of substances such as purple grape juice and catsup using test strips can be difficult. why?

Determining the pH of substances such as purple grape juice and catsup using test strips can be difficult. Why?

Explanation:

Due to the tartaric acid present in these substances, this is a weak acid and is the predominant type of acid in grapes.

pH meters for these substances, measure the total acidity of the sample and convert it into tartaric acid concentration; The test strips are a qualitative method of measurement and their result can give different opinions.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.