qauntitative chem test 3__009

qauntitative chem test 3__009 - 25 points K 4 Suppose that...

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Unformatted text preview: 25 points ' K . 4. Suppose that you want to make a. buffer of pH 7.45. You have phosphoric acid, sodium dihydrogen phosphate, disodium hydrogen phosphate, and trisodium phosphate on your laboratory shelf. u 3% . a) Which two of the above compounds would you deploy for this purpose and why? 3150mm “AW mm (“W“) cm Scam” A’WMCXI‘ QWMK (“3“") W We» ML K» Chomhom’t- “\A StLoMt «we? \oMmyt" 59:023. 03’ A fi>‘c\ 0? W45 0;“3 'leulA gnu >- A rbuéfcr “Rein more; whoop. MM «mounts “Amt“ “W a 523K! bum. b) Suppose you wanted to make 1.00 L of the buffer with a total phosphate concentration of 0.050 0M. How many grams of each of the two selected reagents (assume that they are anhydrous) would you mix together? (SHOWALL THE CALCULATIONS CLEARL!) - 1’ - I -- 8 “sq -_7 \—\ ‘t k “R?- ? \(a = 1‘ \qq kg" 9,31WO’ ""4. ' 2 42%“ ...
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