hydrofluoric acid (hf), cannot be stored in glass bottles because compounds called silicates in the glass are attacked by the hf. sodium silicate (na2sio3), for example, reacts as follows: na2sio3(s) 8hf(aq)  h2sif6(aq) 2naf(aq) 3h2o(l) a) how many moles of hf are needed to react with 0.300 mol of na2sio3?