Question

intrun vas se toarna 500ml de soda caustica de concentratie 20 %si densitae p egal 1,22g si cn la a 3 apooi se adauga 200g de soda caustica deconcentratie 12% Calculeaza calculatia proncentuala a soluti obtinute

Answer 1

ro=ms/V=>ms1=ro*V=1,22*500=610g sol. NaOH

C=md/ms*100=>md=122g

C=md/ms*100=>md2=C*ms/100=12*200/100=24g NaOH

md final = 122+24=146g

ms final = 610+200=810g 

C final = md final/ms final *100 = 146/810*100 =