Reactant Concentrations With an increase in concentration, the number of molecules with the minimum required energy will increase, and therefore the rate of the reaction will increase. Calculate the concentration of sodium thiosulfate in the flask at the start of each experiment. In this experiment,the highest concentration of HCl (2M) had the highest average rate of reaction (30.624 mL/min) after 7 minutes. Factors affecting rate of reaction are variables we can manipulate in order to speed up or slow down reactions. The concentration of A decreases with time, while the concentration of B increases with time. It should be noted that most chemical reactions are zero, first or second order. For example, in the reaction between magnesium and hydrochloric acid, the magnesium is introduced as a solid while the hydrochloric acid is in solution. \(\Theta\) = m+n for two reactants where(\(R=k[A]^m[B]^n\)), \(\Theta\) = m+n+p for three reactants where (\(R=k[A]^m[B]^n[C]^p\)), Boyle's Law: P=k\(\frac{1}{V}\) (PV=nRT at constant n,T), Gay-Lussacs Law: P=k'T (PV=nRT at constant n,V), Charles's Law: V=k''T (PV=nRT at constant n,P), Avogadro's Law V=k'''n (PV=nRT at consantP,T), In going from experiment 1 to 2 we doubled the concentration of [A] at constant [B], [C]and the reaction went 4 times as fast, so the order with respect to A is 2, as 2, In going from experiment 2to 3we doubled the concentration of [B] at constant [A], [C]andthe reaction went 8times as fast, so the order with respect to B is 3, as 2, In going from experiment 2 to 4 we doubled the concentration of [C] at constant [A], [B] andthe reaction went 4 times as fast, so the order with respect to C is 2, as 2. (a) For example, two sets of experiments are carried out using the reacting conditions below: When investigating experimentally the effect of concentration on the rate of reaction. //]]>. Contaminated instruments: flask should be washed carefully with distilled water and rinse or residue wiped well before starting a new trial in order to limit the old reagents get into the new one which decrease the accuracy of the final rate of reaction. There are four main factors that can affect the reaction rate of a chemical reaction: Reactant concentration. Cookies bake faster at higher temperatures. The increased number of collisions caused by a higher pressure increases the reaction rate. //