اذا سمحتي دكتوور ساعديني في حل هاذي الاسئلة :
what mass of k2co3 is needed to prepare 200. Ml of a solution having a potassium ion concentration of 0.150 m?
a 50.0 ml sample of 0.436 m nh4no3 is diluted with water to a total volume of 250.0 ml. What is the ammonium nitrate concentration in the resulting solution?
4. What volume, in ml, of a 3.89 x 10-2 m solution is required to provide 2.12 g of kbr?
(atomic weights: K = 39.10, br = 79.90).