QC Lab - Preparation and Standardization of 0.1N Silver Nitrate Solution

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20 Terms

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AgNO3

molecular formula of silver nitrate

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169.88 g/mol

molecular weight of silver nitrate

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appearance

◦Colorless/white crystalline solid becoming black on exposure to light/ organic material

<p>◦Colorless/white crystalline solid becoming black on exposure to light/ organic material</p>
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lunar caustic

◦Silver nitrate was once called ? because silver was called luna

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halides

◦It is far less sensitive to light than the ?

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photography

This compound is a versatile precursor to many other silver compounds, such as those used in this

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antiseptic

It is an inorganic chemical with ? activity.

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cauterizing/sclerosing agent

agent that stops bleeding by helping form a scab around the wound

◦is also used to help remove warts or skin tags.

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argyria

•The main toxic effect of topical silver nitrate is a generalized gray pigmentation of the skin

AgNO3 + skin = DARK GRAY/BLACK STAIN: decomposition of silver ions = elemental silver

very rare even with topical use; 3.8g everyday

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chronic systemic use

argyria is more common

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fatal gastroenteritis and gastrointestinal bleeding

•If ingested, silver nitrate can cause potentially

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procedure

Dissolve 1.75 g of Silver nitrate crystals in water to make 100mL in a volumetric flask.

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standardization

◦Transfer 0.10 g of reagent grade Sodium chloride, previously dried at 110 degrees Celsius for 2 hours to an Erlenmeyer flask.

◦Add 1 mL of distilled water to dissolve NaCl, then add the following to the solution: 1 mL Acetic acid, 10 mL of methanol and three drops of Eosin Y TS.

◦Mix and titrate the mixture with the silver nitrate solution.

◦Calculate the normality of your standard solution.

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magenta

yellow green to ?

+ acetic acid, methanol, eosin y

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acetic acid

added to prevent premature endpoint of Eosin Y

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eosin y

indicator

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methanol

+ acetic acid = SHARPEST end point

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sodium chloride

primary standard/reagent

n = 1

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normality

= (weight PS/molar mass/n)(1000/titer mL)

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silver nitrate

titer