glass is a mixture of several compounds but a major constituent of most glass is sodium silicate, Na2SiO3...?

Question

continued... Glass can be etched by treatment with hydrogen fluoride producing both gaseous and water soluble products. The reaction is sodium silicate plus hydrogen fluoride yields sodium fluoride plus silicon tetrafluoride plus water. First please write and unbalanced equation for the reaction and then balance it

Answer 1

Na2SiO3 + HF -> SiF4 + NaF + H2O

Na2SiO3 + 6HF -> SiF4 + 2NaF + 3H2O