A. Determination of pH by the Use of Acid-Base Indicators Color with 0.1 M Solut

Question

A. Determination of pH by the Use of Acid-Base Indicators Color with 0.1 M Solution of Indicator Methyl violet Thymol blue Methyl yellow Congo red ZnSO, HCI NaH,PO HC,H,O red enna--mmy - man Bromcresol greenella pH range 2S-2.2s Circle the observation(s) for each solution that was most useful in estimating the pH range. B. Measurement of the pH of Some Typical Solutions Record the pH and the color observed with bromcresol green for each of the 0.1 M solutions that were NaCINa,co, NaC,H,O, NalHSO pH Color For any two solutions having a pH less than 6 or tively why the solution has that pH. Naoh Solution Na HSO uation to explain qualita- otro , Equation Solution Nay cayqati ain why the color observed with bromcresol green for each of the four solutions is reasonable, given the p C. Some Properties of Buffers Buffer system selected NH4Cl HBis O(name the acid) 1. pH of buffer 2. pH of diluted buffer . IONHCL HB is -10 0 pH after addition of 5 drops NaOH pH after addition of 5 drops HCI Comment on your observations in Parts 1 and 2 (continued on following page) 57

Explanation / Answer

Cirlce the obsrvation which was most helpful in identifying the pH:

HCl

NaH2PO4

CH3COOH

ZnSO4

Methyl violet

Blue             

Purple

Purple         

Purple

Thymol blue

Red

Yellow

Orange

Yellow

Methyl yellow

Red

Yellow

Orange

Yellow

Congo red

Blue

Brown

Blue

Orange

Bromocresol green

Yellow

Green

Yellow

Green

In case of HCl all color changes were obvious except for the one with methyl violet. So methyl violet is the one that's most helpful in identifying the pH

In case of NaH2PO4 all color changes were obvious except for the one with thymol blue. So thymol blue is the one that's most helpful in identifying the pH

In case of HC2H3O2 all color changes were obvious except for the one with methyl violet. So methyl violet is the one that's most helpful in identifying the pH

In case of ZnSO4 all all color changes were obvious except for the one with thymol blue. So thymol blue is the one that's most helpful in identifying the pH

HCl

NaH2PO4

CH3COOH

ZnSO4

Methyl violet

Blue             

Purple

Purple         

Purple

Thymol blue

Red

Yellow

Orange

Yellow

Methyl yellow

Red

Yellow

Orange

Yellow

Congo red

Blue

Brown

Blue

Orange

Bromocresol green

Yellow

Green

Yellow

Green

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