pH Indicators The table shows respective color change when a universal indicator

Question

pH Indicators

The table shows respective color change when a universal indicator is added to the clear solutions. Rank the samples based on increasing order of acid strength. Rank the solutions by increasing order of their acid strength. To rank items as equivalent, overlap them. The table shows the pH value and the corresponding color change for a chemical indicator bromothymol blue. Sort the substances based on the expected color change for a solution at the specified pH in bromothymol blue. Drag the appropriate items to their respective bins. Sort the sample solutions as acidic or basic based on the given table for pH range and color change for different indicators. Drag the appropriate items to their respective bins.

Explanation / Answer

a) Increasing order of acedic strength based on PKa values

0.001M hydrogen Peroxide<0.001M hydrofluoric acid<0.01phenol<0.01M nitrous acid

b) Yellow (2-6.5)

vinegar 2.8, apple juice 3.8

Green (6.5-7.5)

milk 6.8, Drinking water 7.2

Blue (7.5-11)

Ammonia solution 11.0, Laundry detergent 8.0

c) Acedic solutions

solution A 0-0.5 yellow in the presence of methyl violet

solution E 0.5-1 brown in the presence of methyl violet

solution C 3.5-4.5 orange in the presence of methyl orange

solution F less than 5.5 red in the presence of methyl red

Basic solutions

solution B 10.5-11.5 orange in the presence of alizarin yellow R

solution D greater than 11.5 yellow in the presence of alizarin yellow R

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