Question

ESTE 5 KG. SOLUTIE DE SODA CAUSTICA DE CONCENTRATIE 20%, SE TAORMA 2 KG. DE SODA CAUSTICA DE CONCENTRATOE 60% SI 1 KG. DE APA.cALCULEAZA CONCENTRATIA PROCENTUALA A SOLUTIE OBTINUTE?

Answer 1

Stim ca c% = mdx100/ms

c1% = 20%

ms1 = 5 kg

=> md1 = 5x20/100 = 1 kg

c2% = 60%

ms2 = 2 kg

=> md2 = 2x60/100 = 1,2 kg

m.apa = 1 kg

=> md.tot = md1 + md2 = 1 + 1,2 = 2,2 kg

=> ms.tot = ms1 + ms2 + m.apa = 5 + 2 + 1 = 8 kg

=> c%.final = md.tot x 100 / ms.tot.

=> c%.final = 2,2x100/8 = 27,5%