Acids and Bases

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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


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