Hydrogen carbonate indicator?
What colour is HCI originally?
What colour does it become?
How do you use it to test for the presence of CO2?
Can it be used to test for the presence of other gases?
Thank you so much. I'd appreciate it answers are given in NORMAL english as in simple enough for a beginner to understad, because I just started learing Chemistry, Biology and Physics as in depth as this. Before this, I was learning it under "Science" and it wasn't as in depth.
Answer:
If you are using hydrogen carbonate then you are using:
what is called sodium bicarbonate NaHCO3
1) the initial color of HCl is clear
and
2) the final color is also clear
3) the thing that indicates the reaction is the formation of BUBBLES by the reaction of the HCl with the NaHCO3:
HCl(aq) + NaHCO3(aq) --> NaCl(aq) + H2CO3(aq)
H2CO3(aq) is unstable in solution and decomposes to form CO2 bubbles:
H2CO3(aq) --> CO2(g) + H2O(l)
the net reaction then is
HCl(aq) + NaHCO3(aq) --> NaCl(aq) + CO2(g) + H2O(l)
Hydrogen carbonate is not an indicator. The common name for it is "baking soda" and is a basic white powder. HCO3- actually adds CO2 to water so you would never use that to detect how much you have.
HCl by itself is a colorless gas (sometimes green if it has CL2 impurity). When put into water you have no color change.
If you really needed to know how much CO2 was in the water a better way would be to simply heat it and measure how much CO2 came off by gas chromotography
If you're looking for acid/base indicators running a search on phenolphthalein may lead you in the right direction...
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