I need some help with the calculation

Jan 19th, 2015
Anonymous
Category:
Biology
Price: $20 USD

Question description

Laboratory Procedure

  1. Record the Label strength of a tablet according to the bottle information. 675mg CaCO3 and 135mg MG(OH)2
  2. Individually weigh 3 tablets and determine the average tablet weight. Average weight 2.5755g

  3.  A number of tablets have been pre-ground to provide the class with sufficient tablet powder for this experiment.

A.   Assay for calcium carbonate

1.  Transfer an accurately weighed portion of the powder, equivalent to about 1000 mg of calcium carbonate, to a beaker with the aid of 60 mL of water, and add 100 mL of 1 N hydrochloric acid.

2.  Heat on a hotplate for 30 minutes in the hood, allow to cool, transfer with the aid of water to a 250-mL volumetric flask, dilute with water to volume, mix, and filter through filter paper on a glass funnel.

  1. Transfer 20.00mL of the filtrate to a suitable container, dilute with water to 100 mL,

add 30 mL of 1 N sodium hydroxide, 5 mL of triethanolamine, and 100 mg of hydroxy naphthol blue.

  1. Titrate with 0.05 M edetate disodium VS until the solution is blue in color.  Repeat for a total of 3 times.

For the Report

Each mL of 0.05 M edetate disodium is equivalent to 5.004 mg of calcium carbonate (CaCO3).

My volume is 19.96

Determine the amount of Calcium Carbonate (CaCO3, 100.086 g/mol)

in the 20.00mL portion (step 6),

in the portion of the tablet powder weighed out,

and in an individual tablet - Report in mg/tab and % of label strength.

The report is what i need to calculation

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