The concentration of the acid decreases
<span>Define symbiosis, commensalism, mutualism, and parasitism. 2. Give two examples of pairs of organisms that have thesesymbiotic relationships: commensalism, mutualism, and parasitism </span>
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When the system turns pink, then the end point has been attained.
<h3>What is the end point?</h3>
The end point or the equivalence point is the time when the reactants have undergone transformation in accordance with the reaction equation. The reaction in this case is; HCl + NaOH -----> NaCl + H2O.
We know that phenolphthalein is colorless in acid but red in a base. The color at end point is pink. Thus, when the system turns pink, then the end point has been attained.
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