https://www.khanacademy.org/science/odia-class-10-physical-sciences/x28e877d8a7566183:acids-bases-and-salts/x28e877d8a7566183:chemicals-from-common-salt/e/water-of-crystallization 2026-04-09T13:00:40.290711197Z Water of crystallization Let's practice writing the number of water of crystallization present in one unit of a given salt. exercise https://www.khanacademy.org/science/telangana-class-7-science/x71e9264c5e9276b1:changes-around-us/x71e9264c5e9276b1:crystallisation/v/water-of-crystallisation 2026-02-27T11:40:39.310460683Z Water of crystallisation In this video, we investigate what happens when blue vitriol (copper sulphate) is heated. As the blue crystals are heated, their colour fades and water droplets appear, leaving behind a white powder. When water is added back, the blue colour returns. Through these observations, we discover that blue vitriol contains water locked inside its crystal structure, called water of crystallisation. We also learn why this change is reversible and classified as a physical change. This investigation-based explanation helps us understand how water of crystallisation affects the properties of crystals. Shankar Nair video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Water of crystallisation In this video, we investigate what happens when blue vitriol (copper sulphate) is heated. As the blue crystals are heated, their colour fades and water droplets appear, leaving behind a white powder. When water is added back, the blue colour returns. Through these observations, we discover that blue vitriol contains water locked inside its crystal structure, called water of crystallisation. We also learn why this change is reversible and classified as a physical change. This investigation-based explanation helps us understand how water of crystallisation affects the properties of crystals. https://cdn.kastatic.org/ka-youtube-converted/15mCOxm4W4o.mp4/15mCOxm4W4o.mp4 270 Crystallisation