反应详情

35 g of SnCl4.5H2O was dissolved in 250 ml of water and added to 250 ml of 3 M phosphoric acid with stirring. Then 0.8 M NaOH was added until a precipitate formed. The mixture was boiled and the precipitate which formed was filtered off and added to 500 ml of 6 M phosphoric acid and refluxed for 24 hours. The solid was filtered off, washed several times with distilled water and air dried overnight. The product was essentially amorphous showing only a few indistinct peaks when exposed to x-radiation. Analysis was close to the composition SnO2.P2O5.4H2O. However, the water content tended to vary from preparation to preparation.

1. customformed
2. customthe precipitate which formed
3. filtrationwas filtered off
4. additionadded to 500 ml of 6 M phosphoric acid
5. temperaturerefluxed for 24 hours
6. filtrationThe solid was filtered off
7. washwashed several times with distilled water and air
8. customdried overnight
9. customAnalysis was close to the composition SnO2
10. customto vary from preparation to preparation