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Hatshy [7]
3 years ago
10

What is the name for the point at which the indicator changes color in a titration? turning point end point indicator point colo

r point NextReset
Chemistry
2 answers:
Sedaia [141]3 years ago
8 0
It says on google
<span>An acid-base indicator (e.g., phenolphthalein) changes color depending on the pH. Redox indicators are also frequently used. A drop of indicator solution is added to the titration at the start; when the color changes the endpoint has been reached, this is an approximation of the equivalence point.</span>
Aloiza [94]3 years ago
8 0

Answer:

End point

Explanation:

Titration is a method of quantitative analysis which is employed to determine the concentration of unknown solutions.

Here a titrant of known concentration is added to a given volume of an analyte solution along with a suitable indicator. The titrant is added gradually until a color change in the analyte is observed. This point is known as the end point.

The end point is usually approximated as the equivalence point wherein the moles of titrant consumed equals the moles of analyte present.

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What concentration of monosodium phosphate would be required to make a solution of pH 7.4 with 0.2 M disodium phosphate ( pKa
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Explanation:

The buffer of H₂PO₄⁻ / HPO₄²⁻ (Monobasic phosphate and dibasic phosphate has a pKa of 7.2

To determine the pH you must use Henderson-Hasselbalch equation:

pH = pKa + log [A⁻] / [HA]

<em>Where [A⁻] is molarity of the conjugate base of the weak acid, [HA].</em>

For H₂PO₄⁻ / HPO₄⁻ buffer:

pH = 7.2 + log [HPO₄⁻² ] / [H₂PO₄⁻]

As molarity of the dibasic phosphate is 0.2M and you want a pH of 7.4:

7.4 = 7.2 + log [0.2] / [H₂PO₄⁻]

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<h3>The concentration of monosodium phosphate is 0.1262M</h3>

<em />

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