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1.what is the ph of a buffer solution made by mexing 40.0ml of .150M k2co3 with...

1.what is the ph of a buffer solution made by mexing 40.0ml of .150M k2co3 with 50.0ml of .100M khco3
i got 6.45 for the ph .
2.what would be the new ph if you took a 30.0ml aliquot of the buffer prepared aboceband added 0.25 mlbof 2.00M hcl
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