Amixture contains only nacl and al2(so4)3 . a 1.45-g sample of the mixture is dissolved in water, and an excess of is added, producing a precipitate of ‍ al(oh)3. the precipitate is filtered, dried, and weighed. the mass of the precipitate is g. what is the mass percent of ‍ in the sample?

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

Which sample at stp has the same number of atoms as 18 liters of ne at stp

Phosphoric acid is a triprotic acid ( =6.9×10−3 , =6.2×10−8 , and =4.8×10−13 ). to find the ph of a buffer composed of h2po−4(aq) and hpo2−4(aq) , which p value should be used in the henderson–hasselbalch equation? p k a1 = 2.16 p k a2 = 7.21 p k a3 = 12.32 calculate the ph of a buffer solution obtained by dissolving 18.0 18.0 g of kh2po4(s) kh 2 po 4 ( s ) and 33.0 33.0 g of na2hpo4(s) na 2 hpo 4 ( s ) in water and then diluting to 1.00 l.