Analysis of Carbon Mixtures by Double Indicator Titrations

EXERCISE 6: ANALYSIS OF CARBON  MIXTURES BY DOUBLE INDICATOR TITRATIONS

                  ANALYTE/S:

                  PRIMARY STANDARD:

                  TITRANT:

                  INDICATOR/S:

STEP

CHEMICAL REACTION INVOLVED

(if there is any)

REASON WHY THE STEP IS DONE

SAMPLE PREPARATION

AND

PRELIMINARY TESTING

Pipet out      mL of the sample

-

Dilute to mark in a

     -mL volumetric flask

-

Put 20 mL of the aliquot in 2 Erlenmeyer flasks

-

In the first flask, add 2 drops of

Indicator and titrate with            until

                 endpoint

In the first flask, add 2 drops of

Indicator and titrate with             until

                 endpoint

Determine the components of the mixture

-

CASE 4 ANALYSIS

Put 20 mL of the aliquot in an Erlenmeyer flask

-

Add 2 drops of

Indicator and titrate with             until

Near equivalence point

-

+

-

Cool and titrate with                          

             until

                         endpoint

-

Put another 20 mL of the aliquot in an Erlenmeyer flask

-

Add                     in excess

Add 2 drops of

                      Indicator and titrate with             until    

                   endpoint

-

CASE FIVE ANALYSIS

Put 20 mL of the aliquot in an Erlenmeyer flask

-

Add 2 drops of

Indicator and titrate with             until

Near equivalence point

-

+

-

Cool and titrate with                          

             until

                         endpoint

-

Put another 20 mL of the aliquot in an Erlenmeyer flask

-

Add       mL of the        

solution

-

Add             to the solution

Add                       indicator and titrate with                  until

                    endpoint

-

Titrate a blank solution containing

Until                         endpoint

-