x R2O的质量
R2O与水反应:
R2O + H2O = 2ROH
2r+16 2(r+17)
x y
(2r+16)/x=2(r+17)/y (1)
碱金属与水反应:
2R + 2H2O = 2ROH + H2
2r 36 2(r+17)
5.4-x 8-y
2r/(5.4-x)=2(r+17)/(8-y) (2)
电子平衡式;
R+ + OH- = ROH
r r+17
x*(2r/(2r+32))+5.4-x 8
r/(x*(2r/(2r+32))+5.4-x)=(r+17)/8 (3)
联合(1)(2)(3)式求解r,通过分子量可以判断是何种碱!
好长时间没有做过化学题了,做起来还真有点费力呀!