Hydrochloric acid Essay Example for Free

Hydrochloric sharp testIntroduction We are trying to find out how the pasture of reaction is affected by the concentration of one of the reactants. We are investigating this with sodium thiosulphate and hydrochloric acid. We will use different strengths of HCI acid and record the results. mode Collect the apparatus. Make up different concentrations of hydrochloric acid using table 1. Measure 20cm3 of sodium thiosulphate and well out into conical flask Draw X on paper and place under conical flask. carefully pour hydrochloric acid into burette using funnel. Remove funnel.Turn the tap on the burette and put down the stop-clock Stop the clock when the X is no longer visible. Record the results and repeat x5. Repeat for 0. 5m and 1. 0m. How to make up the different concentrations of hydrochloric acid. Apparatus Conical flask 6 beakers Clamp stand Burette Stop alfileria Sodium Thiosulphate Different concentrations of HCI acid. Table 2 preoccupation of acid (M) Volume of wat er (ml) Volume of HCI acid (ml)0 What is a reaction? A reaction occurs when two reactants successfully react together to approach pattern a new product.This is called the collision theory. There is umpteen different ways to measure the rate of reaction. These include standard the amount of gas produced Weighing before and after the experiment Draw an X on a piece of paper and measure how long it takes for the substance to turn cloudy enough so that the X is no longer visible Using sensors to detect the loss of the starting material or the fundamental law of the product Variables Temperature If the temperature is high, the particles have more energy. As a result of them having more energy they move a crew faster.Therefore the particles collide a lot faster increasing the rate of reaction and making a new product. Examples of reactions An example of a reaction is when water and iron combine together to skeletal system iron oxide (H2O) (Fe 3) (Fe2 O3) Another example of a reactio n is when zinc and oxygen combine together to form zinc oxide (Zn) (O2) (Zn O2) Concentration If the concentration is greater so to is the number of particles. When you increase the number of particles you increase the adventure of a collision, and the chance of them reacting to form a new product. Surface field of operationsThe smaller the particles the greater the get hold area. Therefore there is a greater chance of them colliding as there is more area for them to have off. Therefore the smaller the particles the greater the rate of reaction. Catalyst A catalyst is a substance, which speeds up the rate of a reaction, without being used up itself. Catalysts work better when the particles are smaller because the surface area is greater. Prediction I think that the high the concentration the faster the rate of reaction. This is because there is more H+ ions so the higher the chance of colliding.Therefore the quicker the reaction. Diagram These are the results I recorded Concentr ation of acid (M) Conclusion From my results I can conclude that concentration does affect the rate dramatically. For example if we canvass strongest strength of acid (1 molar) to the weakest (0.2 molar), there is a difference of nearly 14 seconds between the averages. This is because in the 0. 2 molar acid there is only a small amount of h+ ions where as in the 1 molar acid there is a lot more.Therefore the collisions occur a lot faster and the rate of reaction is increased as illustrated in the diagram above. Science coursework Stephen bannon Show watch only The above preview is unformatted text This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.