AnaChem LAB EXAM

What is the function of phenolphthalein in an acid-base titration?

• To increase the pH

• To detect the equivalence point through color change

• To dilute the acid

• To standardize the base

What color change indicates the endpoint of titration using phenolphthalein?

• Yellow to blue

• Colorless to pink

• Pink to green

• Purple to orange

What is the standard concentration of the NaOH used in Experiment 7?

• 1.0 M

• 0.01 M

• 0.5 M

• 0.1 M

Which of the following is a correct apparatus for delivering exact volume of acid?

• Buret

• Beaker

• Graduated pipette

• Stirring rod

What is the precipitate formed in Experiment 8?

• Silver oxide

• Sodium nitrate

• Silver chloride

• Sodium chloride

What is the role of nitric acid in chloride determination?

• To oxidize the chloride

• To dissolve the silver chloride

• To acidify the solution to prevent unwanted precipitation

• To neutralize sodium chloride

Which reagent is used to wash the precipitate in filtration?

• Tap water

• Sodium hydroxide

• 0.04 M nitric acid

• Ethanol

What is the drying temperature used for the filter paper in Experiment 9?

• 100°C

• 120°C

• 150°C

• 90°C

What is the unit used in weighing precipitates in Experiment 10?

• Grams only

• Milligrams

• Liters

• Moles

What is the formula weight of silver chloride used in the calculation?

• 35.45

• 58.5

• 143.32

• 36.46