Balanced equation formed:
H2SO4 + 2KBr ==> 2HBr + K2SO4
2 HCOONa + H2SO4 → 2 CO + 2 H2O + Na2SO4
React benzene with conc. H2SO4 and then with conc. HNO3. The resultant would be picric acid
Concentrated sulphuric acid. It is H2SO4 in a concentration of probably 6M or above.
3h2so4+fe203------>fe2(H2So4)3 + H20 conc.
Mixture of Conc. nitric acid and Conc. Sulphuric acid
2 HCOONa + H2SO4 → 2 CO + 2 H2O + Na2SO4
React benzene with conc. H2SO4 and then with conc. HNO3. The resultant would be picric acid
Concentrated sulphuric acid. It is H2SO4 in a concentration of probably 6M or above.
3h2so4+fe203------>fe2(H2So4)3 + H20 conc.
hhsggsqq
lABORATORY METHOD:Nitric acid can be prepared in he laboratory by the action of the conc. h2so4 on the potassium nitrate
conc. H2so4
h2so4 being good oxidising agent oxidises the h2s to h2o and free sulphur.so conc h2so4 cant be used in preparation of h2s gas
Mixture of Conc. nitric acid and Conc. Sulphuric acid
nescafe
KAt + H2SO4(conc) = KHSO4 + HAt displacement then .......HAt + .......H2SO4 = At2 + H2S which can be balanced as follows: 2At- = At2 + 2e ] * 4 8e + 8H+ + H2SO4 = H2S + 4H2O overall is 8At- + 8H+ + H2SO4 = H2S + 4H2O + 4At2
Hydrogen cyanide (HCN) is most likely the gas evolved.