The pH scale Flashcards
The pH scale is continuous from below _____ to above _____
0 and 14
What type of solution has a pH less than seven
Acidic
What type of solution has a pH more than seven
An alkali or base
What pH do pure water and neutral solutions have
Seven
Two common acids you use at home
Lemon and vinegar
Two common alkalis you use at home
Baking soda and salt water
What type of solution is formed when ammonia dissolves in water
Alkali
Why do you think alkalis can conduct electricity
There ions are free to move when dissolved in water
What type of bonding do acids have
Ionic bonding
Do alkalis conduct electricity
Yes because their ions are free to carry charge
What type of bonding do alkalis have
Ionic
Which gas is always produced at the negative electrode when acids are electrolysed
Hydrogen
Which ion is present in all acid solutions
H+
Which ion is present in all alkaline solutions
OH-
In water and neutral solutions how do the concentrations of hydrogen ions and hydroxide ions compare
They are equal
How do the concentration of hydrogen ions and hydroxide ions compared to in an acidic solution
More hydrogen ions in an acid
How do the concentration of hydrogen ions and hydroxide ions compare in an alkaline solution
More hydroxide ions in alkalis
What happens to the concentration of hydrogen ions if an acid is diluted (what happens to the PH)
The pH will move towards seven as a solution is becoming less acidic
What happens to the concentration of hydroxide ions if an alkali is diluted (what happens to the PH)
The pH decreases towards seven
How well does pure water conduct electricity
Not very well
Explain how water conducts electricity using equilibrium
the concentrations of reactants and products are the same
