Presentation on theme: "PH Scientists use something called the pH scale to measure how acidic or basic a liquid is The scale looks at the concentration of positively charged hydrogen."— Presentation transcript:
pH Scientists use something called the pH scale to measure how acidic or basic a liquid is The scale looks at the concentration of positively charged hydrogen ions (H+) in a solution vs. the amount of negatively charged hydroxide ions (OH-) The scale goes from values 0 through 14. Brain pop
Acids Acids- A solution that has an excess of H+ ions Acids are found between 0 and 7 on the pH scale Taste sour Corrode metals React with bases to form salts and water
Bases Produce OH- ions in water Taste bitter, chalky Are electrolytes Feel soapy, slippery React with acids to form salts and water
Ok in English please! If you have an ionic compound and you put it in water, it will break apart into two ions. If one of those ions is H+, the solution is acidic. If one of the ions is OH-, the solution is basic. There are other ions that make acidic and basic solutions, but we won't be talking about them here.
Neutral Pure water contains small, but equal amounts of ions: H3O+ and OH- On the pH scale the number is 7
Buffers Buffer- mixtures that can react with acids or bases to keep the pH within a particular range. Buffered aspirin has a coting on it to Keep the acid in your stomach from dissolving it right away.