Acids and Alkalis

• Acids react with metals to produce hydrogen gas.
• The pH scale measures the acidity or alkalinity of a solution on a scale from 0-14.
• Neutral substances have pH values equal to 7
• Alkaline solutions have pH values greater than 7
• Acidic solutions have pH values less than 7
• Acids turn blue litmus paper red, while alkalis turn red litmus paper blue.
• An indicator is used to determine whether a substance is acidic or alkaline by changing color based on its pH level.
• A substance is an acid if it produces H+ ions when dissolved in water, while a base (alkali) will produce OH- ions when dissolved in water.
• An indicator is used to test whether a substance is acidic or alkaline by changing color based on its pH level.
• Baking soda is an antacid that can be used to treat indigestion by neutralizing stomach acids.