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how do you measure the rate of reaction using precipitation and colour change

you can record the visual change in a reaction if the initial solution is transparent and the product is a precipitate which clouds the colution.

you can observe a mark through the solution and measure how long it takes to disappear. The faster it disappears the quicker the reaction.

If the reactants are cloured and products are colourless you can time how long it takes for the solution to lose its colour

how do you measure the rate of reaction through change in mass

measuring the speed of a reaction that produces a gas can be carried out using a mas balance.

As the gas is released the mass disappearing is measured on the balance.

The quicker the reading the balance drops the faster the reaction.

how do you measure the rate of reaction through the volume of gas given off?

This involves the use of a gas syringe to measure the volume of gas given off

The more gas given off during the given time inverval the faster the reaction.

whats the formula for rate of reaction?

amount of reactant used or amount of product formed / time