 Hello! Today, we're going to be examining four products to test for possible cyanide contamination. When you actually do this lab yourself, you'll be looking at all four products, however, for the purposes of this demonstration, we're just going to examine two. So you know exactly how this lab will work out. But first, let's make sure we're following proper safety protocols and let's put on our gloves. First, we'll need two small beakers labeled one and two. The two mystery products. A bottle of 10% sodium hydroxide. A bottle of 10% ferrous sulfate. And a bottle of dilute hydrochloric acid. And then we'll add about 4 milliliters of each substance to their assigned beakers. Next, we add one drop of 10% sodium hydroxide to each beaker and swirl each beaker to mix it up. Next, we add five drops of 10% ferrous sulfate to each beaker. Afterwards, we swirl each beaker again to mix it up. Lastly, we add five drops of dilute hydrochloric acid to each beaker. And again, we're going to swirl each beaker to mix it up and then observe the final result. Here you see that one of the substances has turned red, indicating a positive result for possible contamination. Now you're ready to test your own mystery samples.