Schematic Diagram 72604

CALDERON, Camille Lei V. Schematic diagram: I.

Sample preparation

Titrate this with the HCl solution from exp. 3 until peach endpoint Record volume used (Vmo)

Diluted sample Should be prepared from the original stock Have a ratio of 1:25

Dilute to the mark with previously boiled and cooled distilled water Mix thoroughly Record all volume data needed

Volume data

Phenolphthalein as Indicator Transfer 10.0 mL aliquot of the prepared sample into an Erlenmeyer flask.

Add 2 drops of phenolphthalein Titrate this with the HCl solution from exp. 3 until faint pink endpoint Determine the volume used as Vph.

Dilution factor Data for methyl orange and phenolphthalein Volume sample Total volume II. QUALITATIVE ANALYSIS OF COMPONENTS OF THE MIXTURE

Determine their relationships (Vmo and Vph) determine the components of your unknown mixture show this to your professor

Methyl orange as Indicator Transfer 10.0 mL aliquot of the prepared sample into an Erlenmeyer flask.

proceed to quantitative analysis

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Add 4 drops of methyl orange

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III. QUANTITATIVE ANALYSIS OF NaHCO3-Na2CO3 Swirl again and let precipitate settle Methyl orange as indicator

Transfer 10.0 mL aliquot into an Erlenmeyer flask.

Add 2 drops of phenolphthalein

titrate with the standard HCl solution until the faint pink color.

Add 4 drops of methyl orange prepare a blank Titrate with standard HCl solution until 2 mL less than what was obtained in II.3 (methyl orange as indicator). Boil the solution for 2-3 minutes

Blank Preparation Must consist of in an Erlenmeyer’s flask:

cool to room temperature

10 mL of previously boiled and cooled distilled water

complete the titration to the peach endpoint.

10 mL of 10% BaCl2 solution

Record volume used (Vmo)

Phenolphthalein as Indicator

the same volume of standard 0.05N NaOH solution from step 2 (using phenolphthalein as indicator)

Transfer 10.0 mL aliquot into an Erlenmeyer flask

Add 2 drops of phenolphthalein add 25.00 mL of the standard 0.05N NaOH using buret

add 10 mL of 10% BaCl2 solution using a graduated cylinder

titrate with the standard HCl solution until the faint pink color

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IV. QUANTITATIVE ANALYSIS OF NaOH-Na2CO3

Methyl orange as indicator Transfer 10.0 mL aliquot into an Erlenmeyer flask.

Add 2 drops of phenolphthalein

titrate with the standard HCl solution until the faint pink color. Record volume used as Vph.

CALCULATION PART Add 4 drops of methyl orange titrate with the standard HCl solution until about 2 mL less than what you obtained in II.3

Boil the solution for 2-3 minutes

cool to room temperature

complete the titration to the peach endpoint.

Record volume used as Vmo.

Phenolphthalein as Indicator Transfer another 10.0 mL aliquot into an Erlenmeyer flask.

Add 10% BaCl2 solution drop by drop from a pipet until no further precipitation occurs

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