Answer:
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.
This is because they would naturally dye the test strips in the colors violet and red, regardless of their pH values.
pH, quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
pH is calculated as the negative log of a solution’s hydrogen ion concentration:
pH =-log {10}pH =−log 10
The pH scale is used to rank solutions in terms of acidity or basicity.
Since the scale is based on pH values, it is logarithmic, meaning that a change of 1 pH unit corresponds to a ten-fold change in H+ ion concentration.
pH values are meant to the change the colors as acidic or basic in terms of their own. that's why it becomes difficult to determine the pH of substances such as purple grape juice and catchup using test strips.
Learn more about pH values ,here:
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