Chem 1 Lab Final

In the titration of a monoprotic acid with a monoprotic base, the point at which the same number of moles of acid and base have been added is called the

Equivalence point

Precise determination of the concentration of a solution is called

Standardization

A sample of metal pellets is weighed, heated and then added to a calorimeter containing room temperature water. After adding the majority of the metal sample to the calorimeter it was discovered that some of the metal was not added and has since cooled. If the cooled portion of metal is now added to the calorimeter and the experiment continues, how will the calculated value of the specific head be affected?

The calculated value of the specific heat will be lower than it should be

If the lid of the calorimeter is not put in place after the hot metal is added. How will this affect the final temperature of the system?

The final temperature will be lower.

After determining the composition of a mixture of KClO3 and KCl, it is found that the calculated amount of KCl is incorrectly high. The most likely cause of this is that

a small amount of KClO3 did not decompose, resulting in a smaller mass loss than should have occurred

A potassium hydroxide solution, previously standardized against KHP, is added from a burette to a beaker that contains hydrochloric acid of unknown concentration. One to two drops of phenylalanine have been added to the acid in the beaker. Hydrochloric acid is the

analyte

A student performs a titration in order to determine the concentration of a hydrochloric acid solution. Early in the procedure, the flask is not placed directly under the burette and a small amount of the titrant, KOH, drains down the outside of the flask. How will this error affect the calculated value of the HCL concentration?

calculated value < actual value

After carrying out the reaction and filtering and collecting the product, it be more likely to obtain

slightly less than the theoretical amount of product

In this experiment, the starting temperature of the water receiving the heat from the metal is_____, and the starting temperature of the metal is_______

the temperature of the water inside the calorimeter; the temperature of the boiling water

In the procedure, what was the stated purpose of adding nitric acid, HNO3, to the reaction mixture?

to assist in the formation of large crystals of lead (II)chromate