What color do you expect to observe for cresol purple indicator (Table 10-3) at the following pH
Question:
What color do you expect to observe for cresol purple indicator (Table 10-3) at the following pH values?
(a) 1.0;
(b) 2.0;
(c) 3.0
Table 10-3
Acid color Transition Base Indicator range (pH) color Preparation Methyl violet Cresol red Violet 0.05 wt% in H,O 0.1 g in 26.2 mL 0.01 M NAOH. Then add ~225 mL H,O. 0.1 g in 21.5 mL 0.01 M NAOH. Then add -225 mL H,O. 0.1 g in 26.2 mL 0.01 M NaOH. Then add ~225 mL H,O. 0.1 wt% in H20 0.01 wt% in H2O 0.1 wt% in H0 0.1 wt% in H20 0.1 g in 14.3 mL 0.01 M NaOH. Then add ~225 mL H2O. 0.02 g in 60 mL ethanol. Then add 40 mL H,O. 0.1 g in 23.6 mL 0.01 M NaOH. Then add -225 mL H,O. 0.1 g in 18.5 mL 0.01 M NaOH. Then add ~225 mL H,O. 0.1 wt% in H20 0.1 wt% in H20 0.1 g in 16.0 mL 0.01 M NAOH. Then add ~225 mL H,O. 0.1 g in 28.2 mL 0.01 M NaOH. Then add ~225 mL H2O. 0.01 g in 50 mL ethanol. Then add 50 mL H,O. 0.0-1.6 Yellow 0.2-1.8 Red Yellow Thymol blue Cresol purple Erythrosine, disodium Methyl orange Congo red Ethyl orange Bromocresol green Methyl red Chlorophenol red Bromocresol purple p-Nitrophenol Litmus 1.2–2.8 Red Yellow 1.2-2.8 Red Yellow 2.2–3.6 Orange Red Red 3.1-4.4 Yellow 3.0-5.0 Violet Red 3.4-4.8 Red Yellow 3.8–5.4 Yellow Blue 4.8–6.0 Red Yellow 4.8–6.4 Yellow Red 5.2-6.8 Yellow Purple Yellow 5.6–7.6 Colorless 5.0-8.0 Red Blue Bromothymol blue Phenol red 6.0-7.6 Yellow Blue 6.4-8.0 Yellow Red Neutral red 6.8–8.0 Red Yellow Cresol red 7.2-8.8 Yellow Red See above. a-Naphtholphthalein Cresol purple Thymol blue Phenolphthalein Thymolphthalein Alizarin yellow 7.3–8.7 Pink Green 0.1 g in 50 mL ethanol. Then add 50 mL H2O. 7.6-9.2 Yellow Purple See above. 8.0-9.6 Yellow Blue See above. 8.0-9.6 Colorless Pink 0.05 g in 50 mL ethanol. Then add 50 mL H,O. 0.04 g in 50 mL ethanol. Then add 50 mL H,O. 0.01 wt% in H,0 0.1 g in 70 mL ethanol. Then add 30 mL H,O. 0.1 wt% in H0 8.3–10.5 Colorless Blue Yellow Orange-red Orange-brown Orange 10.1–12.0 Nitramine 10.8–13.0 Colorless Tropaeolin O 11.1–12.7 Yellow
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Related Video
A substance that alters color in solution over a constrained range of pH values is known as a pH indicator or acid-base indicator. The indicator chemical just needs to alter color slightly in order to be noticed. Indicators work on the basis that they react with water to produce the hydrogen cation H+ or hydronium ion H3O+. The indicator molecule\\\'s color changes as a result of the reaction. Since indicators have distinct color ranges for color change, they can occasionally be combined to provide color changes over a wider pH range.
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