Koju zapreminu 20 % -nog rastvora NaOH,gustine 1,21 g /cm3 treba odmeriti da bi se mesanjem sa 100 cm3 5 %-nog rastvora NaOH dobio rastvor masenog udela 7,5 % ?
"A new scientific truth does not triumph by convincing opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it"Max Planck
7,5%=0,075=(0,2x+6,05)/(x+121
7,5%=0,075=(0,2x+6,05)/(x+121) --> x=24,2 g--> V=20 cm3
"A new scientific truth does not triumph by convincing opponents and making them see the light, but rather because its opponents eventually die, and a new generation grows up that is familiar with it" Max Planck