ACID,BASES,INDICATORS AND Ph

What is the pH of a neutral solution at 25°C? 7 What does a pH value greater than 7 indicate about a solution? It is basic or alkaline. What does a pH value less than 7 indicate about a solution? It is acidic. Which ion is responsible for acidity in a solution? Hydrogen ion (H⁺). Which ion is responsible for basicity in a solution? Hydroxide ion (OH⁻). What is the pH range of acidic solutions? 0 to 6.9 What is the pH range of basic solutions? 7.1 to 14 What is the pH of pure water at 25°C? 7 What is the common indicator used to distinguish acids and bases? Litmus What color does blue litmus paper turn in an acidic solution? Red What color does red litmus paper turn in a basic solution? Blue What color does phenolphthalein turn in a basic solution? Pink What color does phenolphthalein remain in an acidic solution? Colorless What is the natural pH of human blood? Approximately 7.4 What is the pH range of stomach acid? 1 to 3 Which substance can be used to neutralize an acid spill? A base, such as baking soda (sodium bicarbonate). Which substance can be used to neutralize a base spill? An acid, such as vinegar (acetic acid). What is the name of the scale used to measure the acidity or basicity of a solution? pH scale What does "pH" stand for? Potential of Hydrogen What happens to the pH of a solution when a strong acid is added to it? The pH decreases. What happens to the pH of a solution when a strong base is added to it? The pH increases. What is a universal indicator? A mixture of indicators that shows different colors at different pH levels. What color does a universal indicator turn in a strongly acidic solution? Red What color does a universal indicator turn in a strongly basic solution? Purple What is the term for a substance that resists changes in pH when an acid or base is added? Buffer What is the pH range of a buffer solution? Typically close to neutral, but it depends on the buffer system. What gas is produced when an acid reacts with a metal? Hydrogen gas What is formed when an acid reacts with a base? Salt and water What is the chemical name of baking soda? Sodium bicarbonate What is the chemical name of vinegar? Acetic acid What happens to blue litmus paper when it is dipped into a neutral solution? It remains blue. What happens to red litmus paper when it is dipped into a neutral solution? It remains red. Acids react to some ______ to give off a gas metals ____________ happens when acids and bases react with each other neutralization When acids and bases react with each other they can form a __________ and usually ___________. salt / water turns blue litmus paper red. acids HCL, stomach acid, lemon juice, vinegar, soda, rain water acids egg whites, baking soda, Tums, ammonia, mineral lime, drano, NaOH bases pure water neutral turns red litmus paper blue bases does not react with blue litmus paper bases does not react with red litmus paper acids does not react with phenolphtalein acids reacts with phenolphtalein turning it magenta bases and neutrals tastes bitter, texture slippery