Titration Curves

Question 1

What goes on the x acid and what goes on the y

Answer 1

Whatever you measure goes on the y and what you change goes on the x

Question 2

What can ph be measured with

Answer 2

Ph meter
Data logged
Chart recorder
Pc

Question 3

How is ph meter calibrated

Answer 3

Placing the probe in a buffer solution of known concentration to improve the accuracy of the ph measurement

Question 4

Why must ph be calibrated

Answer 4

Overtime the storage results in inaccurate reading and therefore needs to be calibrated before

Question 5

What is the method for Cali rating a ph probe

Answer 5

Use a buffer solution
Rinse the probe with distilled water between measurement
Measure the ph more than one buffer solution to improve accuracy and compare the readings
Draw a calibration curve

Question 6

What is a buffer solution

Answer 6

A solution which resist change in ph despite the addition of small amounts of acid or bases or when diluted

Question 7

Explain the titration curve

Answer 7

When the base is first added the ph increases very slightly at first but acid is in excess
Within 1-2 cm the equivalence point the ph increases quickly there is now only a small amount of excess acid left
As further base is added there is little additional in ph and now base is in excess

Question 8

How to obtain a ph curve

Answer 8

Measure the ph of what is in the conical flask using a ph meter
Add solution from the butter in small portions
Swirl the mixture
Measure the ph after the addition
Repeat until the solution from the butette is in excess
Add in small increments near the end point
Plot ph against volume of acid and alkali added