Răspuns:
CH3-CH(CH3)-CH(NH2)-COOH+NaOH--->
CH3-CH(CH3)-CH(NH2)COONa+ H2O
1mol valina.......1molNaOH
2mol.........................x x= niu=2molNaOH
M,NaOH= 40g/mol----> m= niuxM= 2X40g=80g=md
c=mdx100/ms--->ms= 80x100/20g= 400gsolutie
ro=m/v--->v= 400g/1,2g/cm³= 333,3 cm³
Explicație: