Titrating for CO2 in water

[Johnd651]

I decided to see how many ppm of dissolved CO2 I have in my well water post softner. Its been a while since I had to do the math... anyone want to check it?

I used 90mL of water, and titrated with 0.1M NaOH using phenotaylin indicator. I got 0.3 mL of NaOH and worked it out to 14.6 ppm. I attached my math.

 

[Johnd651]

oh... and what is a normal amount of dissolved CO2? I was reading through water testing reports saying up to 30ppm? Just wondering in terms of killing my DI resin.

 

[Johnd651]

Any chemists? I have not had to use these equations in almost ten years now.