MadSci Network: Chemistry

Subject: what can I use to adjust the pH from 5.65 to 6.5?

Date: Wed May 12 19:02:23 1999
Posted by No name entered.
Grade level: grad (science) School: No school entered.
City: No city entered. State/Province: No state entered. Country: USA
Area of science: Chemistry
ID: 926553743.Ch

I have a solution of CaBr2/ZnBr2 which at a 1:10 dilution gives 
me a pH of 5.65. I need something to adjust it to 6.50. I have 
tried ZnO and several strengths of NaOH. NaOH precipitates out 
immediately, ZnO raises it to 5.7 max. Any suggestions?

Re: what can I use to adjust the pH from 5.65 to 6.5?

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