Question

precautions required while finding the ph of samples

Answer 1

Precautions:

1.    Use only the standard colour chart supplied with the pH paper for assessing the ph value.
2.    Keep the pH strips away from chemical fumes.
3.    Either use fresh fine dropper or glass rod for each different sample, or wash the dropper or rod well with water every time.

Answer 2

1) clean the apparatus before adding solutions.

2) use different ph papers.

3) handle the chemicals carefully.