For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8. Pure water is neutral. But when chemicals are mixed with water, the mixture can become either acidic or basic. Examples of acidic substances are vinegar and lemon juice. Lye, milk of magnesia, and ammonia are examples of basic substances.
http://chemistry.elmhurst.edu/vchembook/184ph.html
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Lemon juice is more acidic. Lemon juice has a pH of 2, which is very acidic. Sodium hydroxide is alkaline, with a pH of 14. However, I'd consider sodium hydroxide considerably more dangerous, as even a small splash can cause painful burning. Lemon juice is more acidic. Lemon juice has a pH of 2, which is very acidic. Sodium hydroxide is alkaline, with a pH of 14.
http://www.answers.com/Q/Is_sodium_hydroxide_or_lemon_juice_more_acidic
Titration of freshly squeezed lemon juice with sodium hydroxide (using phenolphthalein indicator) 1  Squeeze the lemons and strain the lemon juice to remove any pulp. 2  Measure exactly 25 mL of lemon juice into the 250 mL conical flask using the pipette.  Add about 75 mL of distilled water to the lemon juice.
http://www.easychem.com.au/the-acidic-environment/acid-base-definitions/titration-experiment
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The scale of pH measurements goes from 0 (the most acidic) to 14 (the most basic). Pure water is right smack in the middle with a pH of 7, which is neutral. The pH scale is logarithmic, meaning. that each one-unit change in pH actually represents a 10-fold change in acidity. For example, lemon juice at pH. 2.0 is ten times more acidic than vinegar at pH 3.0. pH is a measurement of the amount of H+ ions in a. solution. Pure water is considered neutral at a pH of 7 because the number of H+ ions is exactly the same as the. number of OH- (hydroxide) ions produced when these dissociate in water.
http://www.caryinstitute.org/sites/default/files/public/downloads/curriculum-project/4A1_pH_reading.pdf
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The pH scale measures how acidic or basic a substance is. The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic. The pH scale is logarithmic and as a result, each whole pH value below 7 is ten times more acidic than the next higher value. For example, pH 4 is ten times more acidic than pH 5 and 100 times (10 times 10) more acidic than pH 6.
http://chemistry.elmhurst.edu/vchembook/184ph.html
which substance would be more acidic lemon juice or sodium hydroxide
Lemon juice is more acidic. Lemon juice is more acidic than sodium hydroxide.