Question

Which one of the following indicators would be best to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?

Answer 1

When there is 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl, and the pH mathematically given as

pH=4

The indicator is Methyl red

What is best for titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl?

Generally, the equation for the  Chemical Reaction  is mathematically given as

HCl +BOH--->BCl+H20

Therefore

pH=0.5(pkw-pkb-logl)

pH=0.5()14-5.8-logl

pH=4

In conclusion, The best indicator should have pKa =pH

Hence

Methyl red is best

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Answer 2

The best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.

What is an acid-base indicator?

An acid-base indicator is a substance which change colour or develop turbidity at a particular pH.

Acid-base indicators are used during acid-base titrations to detect when neutralization has occured.

The indicators to be used when combining acid and base are as follows:

• Strong acid-strong base - Phenolphthalein
• Weak acid-strong base - Phenolphthalein
• Strong acid-weak base - Methyl orange

Morphine is a weak base while hydrochloric acid is a strong acid.

Therefore, the best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.

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