# I need some help with the calculation

Jan 19th, 2015
DreamIt
Category:
Chemistry
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

### 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

(Top Tutor) Daniel C.
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School: UC Berkeley

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