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The answer is Option B, NaOH is the solution student should use as the base solution in this acid-base titration experiment to determine the amount of ascorbic acid in different brands of juice.
What is an Acid Base Titration ?
An acid–base titration is a method of quantitative analysis.
It is used for determining the concentration of an acid or base by neutralizing it with a standard solution of base or acid of known concentration.
An indicator is used to monitor the progress of the acid–base reaction.
Ascorbic acid, HC₆H₇O₆ is an acid. So can be titrated with a base , sodium hydroxide, NaOH using the indicator, phenolphthalein.
HC₆H₇O₆(aq) + NaOH(aq) → NaHC₆H₇O₆(aq) + H₂O(l)
Among the options , HCl is an acid , LiBr , CaCl₂ are salts , NaOH is the only base.
Phenolphthalein changes from colorless to pink (or red) when all of the acid gets neutralized.
Therefore NaOH is the solution student should use as the base solution in this acid-base titration experiment to determine the amount of ascorbic acid in different brands of juice.
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