1.na+o2-na2o
2/2na2o+h2-2naoh
3/2naoh+h2so4-h2o+2na2so4
4/na2so4+BeCl2-Beso4+2naCl
5/naCl+hno3-nano3+hCl
6/2nano3+k2s-na2s+2kno3
7/na2s+hcl-h2s+nacl
1.na+o2-na2o
2/2na2o+h2-2naoh
3/2naoh+h2so4-h2o+2na2so4
4/na2so4+BeCl2-Beso4+2naCl
5/naCl+hno3-nano3+hCl
6/2nano3+k2s-na2s+2kno3
7/na2s+hcl-h2s+nacl