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    hi all, stuck on these 2 questions:

    1. A buffer solution is made up of phosphoric acid Ka1 = 7.5 x 10-3 , and its sodium salt. Calculate the mass of salt that would need to be added to 1 dm3 of 0.26 M acid in order to prepare a buffer of pH = 2.04.

    If a 400 cm3 portion of the buffer solution was taken, and 30 cm3 of 0.43 M strong acid, H+ added to it, what would be the new pH of the buffer solution be after this addition?
 
 
 
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