Question

A chemist prepares a solution of potassium bromide (KBr) by measuring out 0.50 g of KBr into a 250. mL volumetric flask and filling to the mark with distilled water. Calculate the molarity of Br anions in the chemist's solution. Be sure your answer is rounded to 2 significant digits. mol x s ?

Answer 1

Using, Molar mass of KBr = 119 g/mol. Calculate the moles of KBr as follows: Moles of KBr = mass/molar mass Moles of KBr = 0.50/119 moles But moles of KBr is also equals to the moles of Br ion. Then, moles of Br ion = 0.50/119 moles Calculate the molarity of Br ion as follows: Molarity = (moles)/volume(L) Molarity = (0.50/119)/0.250 Molarity = 1.68*10-2 Mol/L Therefore, answer is 1.68*10-2 Mol/L. Please give good rating.