IDNStudy.com, kung saan ang iyong mga tanong ay natutugunan ng mga eksperto. Makakuha ng impormasyon mula sa aming mga eksperto, na nagbibigay ng detalyadong sagot sa lahat ng iyong mga tanong.

pts) A 25.0 mL sample of water from the lake was acidified and treated with excess sodium molybdate, leading to the formation of 12 -molybdophosphoric acid (12-MPA):

+ 24 H+ =====-> H3PMO12040

+ 24Nat +

12 H20

HsPO4 + 12 NazMoO4

The 12-MPA was separated from the excess sodium molybdate by extraction with two successive 10.0 mL portions of iso-amyl alcohol. When the combined extract was aspirated into the flame of an atomic absorption spectrometer set-up for measuring molybdenum, an absorbance of 0.662 was obtained. The absorbance of a 5.00- ppm Mo standard in the same volume of iso-amyl alcohol was 0.203.Calculate the ppm PO43 in the sample.