Question

Do 0,5 l rozstworu soli 70 % dolano wody i otrzymano 20 % rozstwor tej soli Ile wody dolanodo rozstworu

Answer 1

1l = 1kg = 1000g

0,5l = 500g

 

ms1 = ?

mr1 = 500g

Cp1 = 70%

 

Cp2 = 20%

 

Cp1 = ms1/mr1 * 100%

Cp1 * mr1  = ms1 * 100%

ms1 = (Cp1 * mr1) / 100%

ms1 = (70% * 500g) / 100%

ms1 = 350g

 

mr = ms1 + ma (wody)

500 = 350 + ma

ma1 = 150g

 

Cp2 = ms1/mr2 * 100%

Cp2 * mr2  = ms1 * 100%

mr2 = (100%* ms1) / Cp

mr2 = (100% * 350g) / 20%

mr2 = 1750g

 

mr = ms2 + ma (wody)

1750 = 350 + ma

ma2 = 1400g

 

ma2 - ma1 = 1400 - 150 = 1250g

 

dolano 1250ml wody ( 1,25 l )