81. Methyl red has a pK, 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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Hubert KochLv2

12 Jul 2018

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Sort the sample solutions as acidic or basic based on the given table for pH range and color change for different indicators.

Indicator	pH range and color change	pH range and color change	pH range and color change
Methyl violet	0â0.5 / yellow	0.5â1 / brown	greater than 1 / violet
Methyl orange	less than 3.5 / red	3.5â4.5 / orange	greater than 4.5 / yellow
Methyl red	less than 5.5 / red	5.5â6.5 / orange	greater than 6.5 / yellow
Alizarin yellow R	less than 10.5 / red	10.5â11.5 / orange	greater than 11.5 / yellow

Drag the appropriate items to their respective bins. Which is an acidic solution or a basic solution?

Solution E: brown in the presence of methyl violent

Solution F: red in the presence of methyl red

Solution C: orange in the presence of methyl orange

Solution A: yellow in the presence of methyl violent

Solution D: yellow in the presence of alizarin yellow R

Solution B: orange in the presence of alizarin yellow R

Red cabbage juice is a sensitive acid-base indicator; its colors range from red at acidic pH to yellow in alkaline solutions. What color would red cabbage juice have when 25 mL of a 0.10 M solution of acetic acid is titrated with 0.10 M NaOH to its equivalence point?