22 March 2017 3 9K Report

I need to make 1M sodium carbonate at pH11.5. This is higher than the standard table showing hydrogen cabonate and carbonate solution mixing. My 1M stock is pH11.78. Would adding a little hydrogen carbonate bring it down? The final concentration in the buffer will be 0.2M. I am assuming that I can dilute the 1M solution and the pH will be steady. Is this correct?

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