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Answer:
1) chemical indicators won't work above it's pH range so therefore it probably won't change colour.
2) the solution should be clear and colourless to see colour change.
3) indicators tend to be of low accuracy so it's not 100% reliable.
Answer:
fe3o4+4h2 - 3fe + 4h2o
therefore coefficient is 4
C) volume
.........
The volume of gas depends on e.g. temperature and pressure.
Answer:
if you tell me how much is needed and how much you have then i can answer it, but there is not enough information provided to answer to that question.
Explanation:
