Which of the following represent ways of measuring the concentration in a reaction mixture?

(Choose all that apply) plz

Measure color intensity.
Remove reactant samples and titrate them.
Measure pressure change.
Measure the temperature of the reactants.

Answer:
Yes, the first two. But since the unit of concentration for gasses is pressure, why wouldn't you include the third?
I have done the first two. Measuring color intensity is called spectrofotometry and can be used to determine concentration.

Also titration can be used to determine concentration. The other two I do'n't know.
first 2
For monitoring the concentration in a reaction mixture
- Measuring color intensity can be used ;
- Titration after removal of reactant samples can also be used;
- Measuring pressure change alone may not help without monitoring the volume as well;
- Measuring the temperature of the reactants may also not give results without knowing the pressure and volume also.

Therefore, option 1&2 are correct.

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