Question

17. You are given 2.00 g of a white solid and told that it is a mixture of KC and K.CO;. You dissolve the sample in water and titrate with HCl; complete neutralization requires 23.0 mL of 1.00 M HCI K2CO3+ 2 HC H2CO3+ 2 KC) Calculate the mass of K C03 in the unknown sample. A. 1.23 B. 1.59 C. 1.33 1 D. 1.50 nomnle of NCs was placed into an evacuated 2.00-L flask and allowed to

Answer 1

© Mass of (KCl + K2203) = 2.000 Ke 003 + HO + H2CO3 + 2KOI Hel required 23.0mL X 1: OOM = 23 mmol = 23.0*10-?mol Imol 2mol x 23.0*10-3mol :: Ką coz reaeter = = 0.0115 mol · Mass of K2CO3 in that sample 138,205g/mol = 0.0115 mol x = 1.59 g