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Chem 134 Lab Final. Questions and Answers

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Exam of 3 pages for the course CHEM 134 at CHEM 134 (Chem 134 Lab Final.)

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Chem 134 Lab Final

How many sig figs does a beret have? - answer3

Definition of titration - answer Analytical determined concentration of a unknown
substance by reacting it with a specific amount of a known substance.

What is the sig fig rule for log? - answer Must match the mantissa

What is the sig fig rule for adding and subtracting? - answer maintain at least one
uncertain figure

What is the sig fig rule for multiplication and division? - answer round to the least
precise number

What are the three zero rules? - answerA zero is significant when between 2 nonzero
A zero is never significant before the decimal
A zero is always significant right of the decimal

Definition of Standardization - answerPreliminary titration to determine the molarity of
the titrant

What is the indicator used in to determine the percent of Mg in the formula of a
compound lab? - answereriochrom black (EBT)

What is the titrant in the determination of Mg in the formula of a compound lab? -
answerNa2H2edta

What is the typical standardizing agent for HCl? - answerSodium Carbonate

What is the indicator used for determining the percent of washing soda? - answerMethyl
orange

What color change will happen when methyl orange is used as an indicator? -
answerYellow-orange to red

What color change will occur when EBT is used as a indicator? - answerRed to blue

What is the primary standardizing agent for permanganate? - answerNa2C2O4

What is the indicator used to analyze hydrogen peroxide solution? - answerMnO4
(permanangate)

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