Know by name and by their colours in ‘acid’ and ‘alkali’ the following indicators: Methyl orange: acid=____ , alkali= ____ Litmus: ____=red , alkali=____ Phenolphthalein: acid=____ , alkali= ____ ____ indicator is a ____ of different ____ which change ____ in a ____ way over a ____ of pH. Universal indicator has ____ colours at lower pH, a green colour at a neutral pH and colder colours at higher pH. These are the important points about the pH scale: neutral solutions are ____ exactly acidic solutions have pH values ____ ____ solutions have pH values ____ the closer to ____ you go, the more strongly ____ a solution is the closer to ____ you go, the more strongly alkaline a solution is How to answer two mark pH questions. Q1. Why is a ____ with a pH of 5 ____?A1. A solution with a pH of 5 is acidic because pH 5 is ____ and solutions with a pH ____ 7 are acidic. Q2. Why is a solution with a pH of 10 alkaline? A2. A solution with a pH of 10 is alkaline because pH 10 is ____ and solutions with pH above 7 are ____. Q3. Why is a solution with a pH of 7 neutral? A3. A solution with a pH of 7 is neutral because a pH of 7 has equal concentrations of H⁺ and OH⁻ ions (GCSE/A level) but interesting to know. or A pH of 7 is defined as neutral.

Indicators and pH

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