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noname [10]
3 years ago
8

When does phenolphalien turn pink

Chemistry
1 answer:
rewona [7]3 years ago
3 0

Answer : Phenolphalien turn pink in the presence of a base.

Phenolphthalien : It is an indicator which is used in the acid-base titration.

In acidic medium, the phenolphthalien is colorless and the pH will be less than 7.

In basic medium, the phenolphthalien is pink in color and the pH will be greater than 7.

Phenolphthalien is slightly soluble in the water and highly soluble in alcohols.

Hence, the phenolphalien turn pink in the presence of a base.

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Answer:

67.1%

Explanation:

Based on the chemical equation, if we determine the moles of sodium carbonate, we can find the moles of NaHCO₃ that reacted and its mass, thus:

<em>Moles Na₂CO₃ - 105.99g/mol-:</em>

6.35g * (1mol / 105.99g) = 0.0599 moles of Na₂CO₃ are produced.

As 1 mole of sodium carbonate is produced when 2 moles of NaHCO₃ reacted, moles of NaHCO₃ that reacted are:

0.0599 moles of Na₂CO₃ * (2 moles NaHCO₃ / 1 mole Na₂CO₃) = 0.1198 moles of NaHCO₃

And the mass of NaHCO₃ in the sample (Molar mass: 84g/mol):

0.1198 moles of NaHCO₃ * (84g / mol) = 10.06g of NaHCO₃ were in the original sample.

And percent of NaHCO₃ in the sample is:

10.06g NaHCO₃ / 15g Sample * 100 =

<h3>67.1%</h3>
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