Question

200g solutii de acid de concentratie 20% se amesteca cu 600g solutii de acid de concentrate 80%.ce concentratie va avea solutia finala?

Answer 1

ms1= 200g, c1% = 20%

ms2= 600g, c2% = 80%

stim ca c% = mdx100/ms

=> md1 = ms1xc1/100 = 200x20/100 = 40 g

=> md2 = ms2xc2/100 = 600x80/100 = 480 g

c%.final = md.finalx100/ms.final

=> md.final = md1+md2 = 40+480 = 520g

ms.final = ms1+ms2 = 200+600 = 800g

=> c%.finala = 520x100/800 = 65%