(Solved): A buffer solution is composed of 1.795g of KH2PO4 and 4.924g of Na2HPO4. (Ka for ...

A buffer solution is composed of $1.795\mathrm{g}$ of ${\mathrm{KH}}_2{\mathrm{PO}}_4$ and $4.924\mathrm{g}$ of ${\mathrm{Na}}_2{\mathrm{HPO}}_4$. $(K_{\mathrm{a}}$ for dihydrogen phosphate ion is $6.2\times 10^{?8}$.) a. What is the $\mathrm{pH}$ of the buffer solution? $\mathrm{pH}=$ b. What mass of ${\mathrm{KH}}_2{\mathrm{PO}}_4$ must be added to decrease the buffer solution $\mathrm{pH}$ by 0.10 unit from the value calculated in part a? Mass $=g$ 4 item attempts remaining