How does acid rain affect diffrent housing materials?

Materials:
4 bricks, 4 shingels, 4 peices of laxand, 4 nails, 4 screws (four of four diffrent kinds), 4 small peices of wood, 4 small peices of aluminum,4 peices of galvenized metal, 3 jars, 3 squart bottles, out door house paint, gloves, apron, safty goggles,and muratic acid(HCl)

Purpose:
To find out how acid rain affects diffrent housing materials.
Hypothesis:
The research that has ben done points to the solution containg 75% muratic acid and 25% water, should have the greatest affec on the housing materials.
Procedure:
1) Take the muratic acid and fill the jar 1/4 of the way fill, then fill it the rest of the way full with water, and then lable it 25% acid/75% water. 2) Take the muratic acid and fill the jar 1/2 of the way full then fill it the rest of the way full with water, and then lable it 50% acid/50% water. 3)Take the muratic acid and fill the jar 3/4 of the way full, then fill it the rest of the way full with water, and then lable it 75% acid/25% water. 4) set up the rack of 3 levels with each containg the same things. Then lable each level. 5)Pour a small amount of 25/75 into the spray bottle labled 25/75. Then spray carefully all over the section labled 25/75. Take observations. Then pour remaning solution back into its jar. 6)Pour a small amount of 50/50 into the spray blottle labled 50/50. Then spray carefully all over the section labled 50/50. Take observations. Then pour the remaing solution back into its jar. 7)Pour a small amount of 75/25 into the spray blottle labled 75/25. Then spray carefully all over the section labled 75/25. Take observations. Then pour the remaing solution back into its jar. Repeat often.

Observations:
Oct. 9th-
When the solution of 50/50 was sprayed over the section labled 50/50, there was some toxic fumes coming off of the peice of galvenized metal and it turned a little black.
When the solution of 75/25 was sprayed over the section labled 75/25, there was some bubbling,and a sound of sizzling on the peice of galvenized metal. Also the steel screw (screw 1) sizzeld and bubbled.
When the solution of 25/75 was sprayed over the section labled 25/75, there was a little sizziling on the metal but not very much.
Oct.11th-
When the 50/50 solution was sprayed on its contents the g.metal gave of some toxic gas and it started to move around and bubble.
When the 75/25 solution was sprayed the g.metal gave off a very strong toxic gas and it moved it around,it bubbled and sizzled.
When the 25/75 solution was sprayed on the materials nothing happend.
Oct.13th-
When the 50/50 solution was sprayed on its contents the g.metal gave of some toxic gas and it started to move around and bubble.
When the 75/25 solution was sprayed the g.metal gave off a very strong toxic gas and it moved it around,it bubbled and sizzled.
When the 25/75 solution was sprayed on the materials a litte toxic gas was given off.

Oct.17th-
When the 50/50 solution was sprayed on its contents the g.metal gave of some toxic gas and it started to move around and bubble.
When the 75/25 solution was sprayed the g.metal gave off a very strong toxic gas and it moved it around,it bubbled and sizzled.
When the 25/75 solution was sprayed on the materials a litte toxic gas was given off.
Oct.19th-
When the 50/50 solution was sprayed on its contents the g.metal gave of some toxic gas and it started to move around and bubble. Also the nail and the 4 types of screws are starting to rust.
When the 75/25 solution was sprayed the g.metal gave off a very strong toxic gas and it moved it around,it bubbled and sizzled. Also the nail and screws are real rusted, the laxand has spots and the wood is being eaten away at. The brick has crystals on it.
When the 25/75 solution was sprayed on the materials a litte toxic gas was given off. The nails are getting a little rusted.
Nov.14th-
When the 50/50 solution was sprayed on its contents the g.metal gave of some toxic gas and it started to move around and bubble. Also the nail and the 4 types of screws are starting to rust. The laxand has spots that look like