I am making a waterfall model for a school project and i'm planning on using plaster of paris.Its the first time i will be using it so i have few questions.1) can i mix tissue or newspaper in plaster of paris to make the model?2) Is it necessary to seal it before paintingIf yes then what should i use? Can i use poster paints3) It is a working model so i will be using a filter to circulate the water.Will the Plaster of paris dissolve in the water after hardening?Is there anything more i need to know about PoP
1Generally no and certainly not if you are going to run water over itCloth can be mixed/coated with plaster of Paris like making a cast for a broken arm, but not paper2Are you going to be running water over the paint - it is unlikely to enjoy thatYou might use blue food coloring mixed with the plaster used in the area of the running water to give a basic color3Plaster of Paris will not dissolve in water but it will tend to absorb water unless you use some of the more expensive versions (Hydrocol I believe) that to do notYou will have to make your model in some kind of tray arrangement - a cut down metal baking pan or an aluminum foil or plastic lined wooden shallow box - to keep the water from soaking through and damaging whatever surface you set it on.
if you look at this as a single replacement reaction, Al is less reactive than H the balanced reaction would be 3H2SO4 + 2Al - Al2(SO4)3 + 3H2 Al is less reactive than H in the H2SO4 so it wouldn't replace it
