lecture 15

Here’s a summary of acid stimulation in oil wells based on various sources:
1. (00:01): The video demonstrates the reaction between calcium carbonate (CaCO₃) and hydrochloric acid (HCl), showing the immediate production of calcium chloride, carbon dioxide gas (bubbles), and water.
2. (00:31): The equation for the reaction is shown, explaining that this reaction is important in understanding ocean acidification, where weak acids dissolve calcium carbonate over time.
3. (01:02): A seashell, primarily composed of calcium carbonate, is shown dissolving when hydrochloric acid is applied, with carbon dioxide gas bubbles observed, mimicking the ocean acidification process.
4. (01:17): Ocean acidification occurs as carbon dioxide from fossil fuel emissions is absorbed by oceans, creating mild acids that dissolve shells and disrupt marine ecosystems.
5. (01:31): The video concludes with Dr. B discussing the impact of ocean acidification on aquatic life and thanking viewers.

transcript

"(00:01) in this video we're going to take a look at what happens when we put calcium carbonate with hydrochloric acid that's caco3 plus hcl here you can see we have the solid that white powder that's the calcium carbonate and then we drop the aqueous hcl hydrochloric acid right on that and the reaction happens right away we get calcium chloride that's dissolved in the liquid and carbon dioxide gas those are the bubbles you're seeing and then some water so this is the equation for the reaction of calcium carbonate with (00:31) hydrochloric acid and it's kind of important because when the ocean absorbs carbon dioxide it produces a weak acid it's not hydrochloric acid but it's enough of an acid that it dissolves shells like in the picture here over time it's called ocean acidification so watch what happens when i take a shell a seashell and i put some hydrochloric acid on again this is stronger than what would happen with ocean acidification but you can see those bubbles that's the carbon dioxide gas we saw earlier that (01:02) calcium carbonate that shell which is made of mostly calcium carbonate it's dissolving after a while it'll be gone all of it will be dissolved calcium chloride dissolved in the solution the gas will go away the carbon dioxide and we'll have a little extra water ocean acidification happens because fossil fuels create a lot of carbon dioxide that gets absorbed in the ocean and that makes the ocean a little bit more acidic and that can have a big impact on aquatic life like animals with shells and the animals that eat them (01:31) it's dr b with the reaction of calcium carbonate with an acid in this case we used hydrochloric acid thanks for watching you"