CHEM 134 LAB FINAL QUESTIONS WITH COMPLETE SOLUTIONS

CHEM 134 LAB FINAL QUESTIONS WITH COMPLETE
SOLUTIONS
How many sig figs does a buret have? Ans✓✓✓ 3


Definition of titration Ans✓✓✓ 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? Ans✓✓✓ Must match the mantissa


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


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


What are the three zero rules? Ans✓✓✓ A 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 Ans✓✓✓ Preliminary 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? Ans✓✓✓ eriochrom black (EBT)


What is the titrant in the determination of Mg in the formula of a
compound lab? Ans✓✓✓ Na2H2edta


What is the typical standardizing agent for HCl? Ans✓✓✓ Sodium
Carbonate


What is the indicator used for determining the percent of washing soda?
Ans✓✓✓ Methyl orange


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


What color change will occur when EBT is used as a indicator?
Ans✓✓✓ Red to blue


What is the primary standardizing agent for permanganate? Ans✓✓✓
Na2C2O4


What is the indicator used to analyze hydrogen peroxide solution?
Ans✓✓✓ MnO4 (permanangate)