1) Along with the pH scale, there is the pOH scale, which indicates the level of
ID: 882209 • Letter: 1
Question
1) Along with the pH scale, there is the pOH scale, which indicates the level of "basicity" in a solution. Accordingly, pOH = -log[OH-]. What is the sum of the pH and the pOH of a solution always equal to?
the negative of the product of the hydronium and hydroxide ions
the negative log of Kw, which is 14
The sum would equal 7, since that would be neutral for pH and pOH.
It is not constant because it depends on the acid/base solution in question.
2)Which of the following statements is not true about a neutralization reaction?
Water is always formed in a neutralization reaction.
One molecule of acid neutralizes one molecule of base.
A neutralization is the reaction of a hydroxide ion with a proton.
All of these are true.
None of these are true.
3)What best describes what happens when an acid such as HCl is mixed with water?
The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion.
A proton from the chlorine nucleus is ejected and captured by a water molecule to form a negatively charged HCl and a new hydronium ion.
A hydroxide ion from the water is transferred to the HCl molecule to form a proton and hydronium ion.
HCl is not an acid.
None of these
4)If a solution is a poor conductor of electricity, which of the following is true?
The solution is highly ionized.
The solution is slightly ionized.
The solution is highly reactive.
The solution is slightly reactive.
none of these
5) According to the following reaction, which molecule is acting as a base?
H2SO4
H2O
H3O+
HSO4-
None of these
Explain each answer
the negative of the product of the hydronium and hydroxide ions
the negative log of Kw, which is 14
The sum would equal 7, since that would be neutral for pH and pOH.
It is not constant because it depends on the acid/base solution in question.
Explanation / Answer
1) [H+] X [OH-] = Kw = 10^-14
so pH + pOH = pKw = 14
2) In nueturalization a molecule of acid neutralize a moelcule of base to give a salt and water.
so reaciton of neutralization is reaction of H+ + OH- --> H2O
So all are true
3) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion.
The reaction is
HCl + H2O --> H3O+ + Cl-
4) conductivity of solution is primarily due to ions so a solution is a poor conductor of electricity will be poorly ionized
5) the base is one which is accepting H+ from other
So HSO4- is base
6) image no clear
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