Question
Asked Jan 8, 2020
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 Methyl red has a pKa of 5.0 and is red in its acid form and yellow in its basic form. If several drops of this indicator are placed in a 25.0 mL sample of 0.100 M HCl, what color will the solution appear? If 0.100 M NaOH is slowly added to the HCl sample, in what pH range will the indicator change color? 

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Expert Answer

Step 1

Methyl red is an indicator. In acidic medium, it turns into red colour and in basic medium it turns into yellow colour. Therefore, If several drops of methyl indicator are placed in a 25.0 mL sample of 0.100 M HCl, the solution will appear red in colour.

Step 2

Methyl red indicator acts as acidic buffer. The Henderson- Hasselbalch equation is shown as follows:

Chemistry homework question answer, step 2, image 1
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Step 3

The ratio of conjugate base to acid should be in the range of 0.1 to 10.  When acid or base added, a bu...

Chemistry homework question answer, step 3, image 1
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