Double Replacement Reaction Lab Answer Key

Double Replacement Reaction Lab Answer Key Introduction:

Double replacement reaction labs are one of the most challenging labs for high school and college students. In a double replacement reaction, two ionic compounds exchange ions, reacting to create two new compounds. As someone who has gone through this experiment before, trust me; I understand the struggle students go through in grasping the concepts of this lab. Fortunately, with a step-by-step guide, you too can achieve success in your double replacement reaction lab. In this blog post, I have provided a double replacement reaction lab answer key that will help you ace your lab and emerge with flying colors!

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Step One: Observe the Reactants

In this lab, we will react Copper Sulfate (CuSO4) with Sodium Hydroxide (NaOH). The expected outcome of this reaction is for the blue copper sulfate solution to turn a pale blue and then to a green precipitate, which indicates the presence of copper hydroxide.

Step Two: Balancing the Equation

Before reacting the two solutions, we first need to balance the equation. Once balanced, it will help you understand how much of each substance is necessary to react fully.

CuSO4(aq) + 2NaOH(aq) → Cu(OH)2(s) + Na2SO4(aq)

Step Three: Perform the Reaction

As you prepare the solutions for the reaction, run the copper sulfate solution slowly and steadily into the sodium hydroxide solution, which will be constantly stirring. Once the addition is complete, let the mixture sit overnight for the results to become visible.

Step Four: Observing the Reaction Results

The final result after the reaction will be a light green precipitate that looks like a slurry. The supernatant is Na2SO4, and the green precipitate is Cu(OH)2. You need to filter the solution from the precipitate using a vacuum filter and then dry the Cu(OH)2 to get an accurate weight.


Double replacement reactions can be daunting, but with practice and careful attention to detail, you can master it. This experiment is a fantastic way of learning the principles of chemistry, and with the double replacement reaction lab answer key provided in this blog post, you can be sure that you will ace your lab with ease. Remember, don’t hesitate to ask for help from your teacher or a chemistry tutor if you need it. Good luck!

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