pH Flashcards
pH def
Potential hydrogen; a numerical measurement that indicates the acidity or alkalinity of a water-based substance
Only solutions containing _____ or solutions that can be dissolved in ________ can have a value that is ________ or ________
Only solutions containing water or solutions that can be dissolved in water can have a value that is acidic or alkaline
Acids and alkalis change the balance of ____ and ___ ions in water
Hydrogen and hydroxide
Acids def
A substance that increases the concentration of hydrogen ions when places in water because it donates, or releases H+ ions; tends to taste sour and react strongly with metals
When acids and alkalis are brought together, they
Neutralize each other
Alkalis tend to taste and feel like what
Bitter and feel slippery
If a solution is acidic, then
A solution has more positive hydrogen ions than negative hydroxide ions
If a solution is neutral, then
A solution has an equal number of positive and negative ions
When a solution is alkaline, then
The solution has more negative hydroxide ions
Distilled water on the pH scale
Neutral pH of 7
pH values below 7 indicates more
Acidity
pH values above 7 indicates more
Alkaline
Logarithmic def
Each change of value along the pH scale is a change of 10x
The pH scale is a logarithmic scale that ranges from
0-14
Three ways to measure pH
pH meter
Universal indicator solution
Universal indicator paper
Of the three ways to measure pH, which is most accurate
The pH meter
Indicator solution and indicator paper both use ______ _____ to indicate pH
Color changes
What time of paper is the indicator paper and what colors does it turn
Litmus paper
Blue litmus paper turns red in an acid; red litmus paper turns blue in an alkali
What is the pH balance of the skin
4.5-5.5
What can high pH products do to your skin
Can strip the protective layer of the acid mantle; change the skin’s pH to a highly alkaline level
Permeability def
The skin’s ability to allow liquids or gasses to pass through it
After using a high pH product (cleanser), its recommended to apply
A mild pH balancing toner or moisturizer to restore the skin’s pH to its natural range
