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inna [77]
3 years ago
12

Bromophenol blue is the indicator used in detecting the endpoint for the antacid analysis in this experiment. what is the expect

ed color change at the endpoint?
Chemistry
1 answer:
Paul [167]3 years ago
7 0
Hello!

For the antacid analysis, the chemical reactions that occur in the titration are the following ones:

First, the antacid (composed of weak bases and carbonates) is completely neutralized by the H⁺ ions in the HCl

2HCl + CaCO₃ → CO₂ + H₂O + 2CaCl₂

HCl + OH⁻ → H₂O + Cl⁻

The titration reaction consists in titrating the excess H⁺ ions that are left in the solution, by the following reaction:

H⁺ + NaOH → H₂O + Na⁺

So, when the equivalence point is reached, the solution will go from acid to basic. As bromophenol blue is yellow in acidic solution and blue in basic solution, you'll expect the indicator to change from yellow to blue.

Have a nice day!
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This is the reaction that produces NH₃.  Use the mole ratios to solve.  For every 3 moles of H₂ that are consumed, 2 moles of NH₃ are produced.

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