3. you test an unknown sample with iodine and vinegar. it turns black and produces bubbles. what does this…
3. you test an unknown sample with iodine and vinegar. it turns black and produces bubbles. what does this say about the composition of the sample? type your answer here.
Answer
Brief Explanations:
Iodine turns black in the presence of starch. Vinegar (acetic acid) produces bubbles when reacting with a carbonate - containing substance. So the sample likely contains starch and a carbonate.
Answer:
The sample likely contains starch and a carbonate - containing substance.