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what is the mole fraction of compound if 3.9 g of benzene is dissolved in 4.6 g of toluene

0.25 M Formic acid soultion pKa 3.75,

Clculate the pH for the formic solution

Calculate the pH for the soluton after addition of solid sodium formate to cause the formate ion (CHOO-) to increase to 0.2 M

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