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Design Lab- Acid Rain

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Chemistry Laboratory Report To test the effect of Acid Rain on Building Material Design Nikita Bansal B.D.Somani International School Chemistry Standard Level Candidate Number- 002602015 Session: May 2010 Aim: To test the effect of acid rain on building materials. Research Question: How do different concentrations of Nitric Acid (HNO3) by 2M affect the rate of reaction to completely erode limestone (Building material) keeping mass of limestone taken, volume of acid and room temperature and pressure constant? Background Information: Acid deposition is the acidic particles that are deposited or fall to the Earth in either the wet or dry form. It includes wet depositions of both oxides of sulphur as well as oxides of nitrogen. Acid Rain is rain with a pH of 4.2 or lower which indicates its acidity. It is believed that the main contributors to the acidic properties of this rain are oxides of sulphur and oxides of nitrogen. ...read more.


The Nitric Acid in the acid rain reacts with this Calcium Carbonate which results in formation of a soluble solution which washes away with the rain leading to erosion. CaCO3(s) +2HNO3 (g) --> Ca (NO3)2(s) +CO2 (g) +H2O (g) Hypothesis: Nitric Acid is highly acidic and reacts with alkalis. Due to its high acidic properties, it is highly corrosive and leads to corrosion of various building materials. In the experiment, three different concentrations of Nitric Acid are taken. One is dilute Nitric Acid, one is moderately concentrated Nitric Acid and the third is doubly as concentrated as the second Nitric Acid. If the concentration of the acids is stronger, the rate of reaction will occur more quickly because it increases the amount of molecules the molecules of the other reactant can collide with. Therefore there is more collision, speeding up the reaction. ...read more.


Observe until entire piece of limestone has been eroded away. ix) Stop the individual timers every time an entire piece of limestone has been eroded away. x) Check the time from start to stop time and record the time taken for complete erosion of limestone in all three test tubes. Precautions The mass of the limestone must be exactly the same The concentrations of Nitric Acid must range from lowest to highest. Apparatus i) 3 Test tubes of equal sizes ii) 0.025 dm3 of dilute Nitric Acid (2M) iii) 0.025dm3 of moderately concentrated Nitric Acid (4M) iv) 0.025dm3 of concentrated Nitric Acid (6M) v) 3 pieces of limestone, all of the same mass of 5 grams vi) Electrical Balance (error of � 0.95g) vii) 3 digital timers Data Table Concentration ofAcid Taken Mass of Limestone Time taken to completely erode the Limestone Dilute HNO3 (2M) 5 grams Moderately Conc HNO3 (4M) 5 grams Conc HNO3 (6M) 5 grams ?? ?? ?? ?? Nikita Bansal Chemistry Standard Level Candidate Number- 002602015 Design Lab ...read more.

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