Agalvanizing effluent contains a total zinc concentration of 10-3 mol / l and ph < 2. considering that the proposed treatment is lime neutralization and zinc removal by precipitation of zn (oh) 2, i ask: what is the best precipitation ph?
mw zn: 65; k1 = 1.4x104; k2 = 1x106; k3 = 1.3x104; k4 = 1.8x10; kw = 1x10-14

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Select the correct lewis structure for fluorine which is group 7a element?