Using Table 16.1 in the textbook, pick an indicator for use in the titration of

Question

Using Table 16.1 in the textbook, pick an indicator for use in the titration of CH3NH2 with a strong acid.

bromeresol green, methyl red eriochrome or black T

Using Table 16.1 in the textbook, pick an indicator for use in the titration of NaOH with a strong acid.

Using Table 16.1 in the textbook, pick an indicator for use in the titration of  with a strong acid.

methyl red, Eriochrom Black T, bromeresol purple or alizarin

Using Table 16.1 in the textbook, pick an indicator for use in the titration of C6H5NH2 with a strong acid.

Using Table 16.1 in the textbook, pick an indicator for use in the titration of  with a strong acid.

o-cresolphthalein or phenolphthalein 2,4-dinitrophenol or bromphenol blue phenol red or m-nitropheno methyl red, Eriochrom Black T, bromeresol purple or alizarin

bromeresol green, methyl red eriochrome or black T

Using Table 16.1 in the textbook, pick an indicator for use in the titration of NaOH with a strong acid.

Using Table 16.1 in the textbook, pick an indicator for use in the titration of  with a strong acid.

alizarin, bromthymol blue or phenol red bromeresol green or methyl red phenol red or m-nitropheno o-cresolphthalein or phenolphthalein

methyl red, Eriochrom Black T, bromeresol purple or alizarin

Using Table 16.1 in the textbook, pick an indicator for use in the titration of C6H5NH2 with a strong acid.

Using Table 16.1 in the textbook, pick an indicator for use in the titration of  with a strong acid.

erythrosine B bromeresol green, methyl red or eriochrome black T bromphenol blue or bromeresol green eriochrome black T, bromeresol purple or alizarin thymol blue

Explanation / Answer

(1)

In the titration of CH3NH2 ( weak base)with a strong acid, the pH at the equivalent point is less than 7 thus use the methyl red, Eriochrom Black T, bromeresol purple or alizarin etc.

(2)

in the titration of NaOH, strong base with a strong acid the pH at the equivalent point is equal to 7 thus use the: alizarin, bromythol blue or phenol red.

(3)

in the titration of C6H5NH2 with a strong acid the pH at the equivalent point is less than 7 thus use the : erythrosin b

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