Acids and Bases
which of the following are properties of bases?
-they conduct electricity -they feel slippery -they taste bitter
the pH value of milk is close to _____.
6.3
A 1 unit change in pH is equal to:
A 10 fold change in hydrogen ion concentration
Which of the following acids would be termed aqua fortis as it is corrosive to nearly all the metals?
HNO3
is coffee an _____ substance
acidic
a _____ is an ionic compound that produces negative hydroxide ions when dissolved in water
base
If a material has a pH of 9.3, is it acidic or basic?
basic
State the color which emerges on a neutral litmus paper in the presence of an alkaline medium.
blue
The pH value gives us an instantaneous idea about relative strengths of solutions.
false
Under normal conditions, NaOH completely ionizes as: NaOH⟶NaO+H+.
false
When an acid is dissolved in water, the pH will be more than that of pure water.
false
an example of a weak base is sodium hydroxide
false
bases can react with metals
false
litmus paper is the only indicator of acids
false
pure water has a pH of 10 at 298 K
false
the high pH of a solution indicates its high acidity
false
weak bases are good conductors of electricity
false
Which one of the following is correct option: hydrogen, hydroxide, peroxide? pH is a measure of the _______ ion concentration of a solution.
hydrogen
Which one of the following is the correct option for fill in the blank: cations, anions, ions? The strength of an acid or a base depends on how much of it breaks down into _____ when it dissolves in water.
ions
do bases react with metals the same way that acids do?
no
An acid is an ionic compound that produces ______ hydrogen ions when dissolved in water.
positive
HCI is an example of an acid
true
The low pH of gastric juices facilitates digestion, whereas a higher pH of blood is necessary for the transport of oxygen.
true
The negative logarithm of concentration (in mol L−1) of hydrogen or hydronium ions in a solution is called the pH value of solution.
true
The pH of the environment is important for living things because most can survive only within a relatively narrow range of acidity.
true
The strength of an acid depends on how many hydrogen ions it produces when it dissolves in water.
true
acidity is the hydrogen ion concentration of a solution
true
acids can cause certain organic dyes to change color
true
all acids taste sour
true
an example of a base is sodium hydroxide
true
bases feel slippery to the touch
true
bases turn red litmus paper blue
true
on reaction with metals, acids release hydrogen gas
true
pH of a solution is a dimensionless quantity
true
sodium chloride has pH of 7
true
the lower the pH value, the larger the concentration of hydrogen ions
true