Your doorbell is malfunctioning, It will only strike the bell one time when the

Electromagnet plays a very important role by creating a magnetic field which will in turn pull the armature towards it, thereby causing the hammer to strike the bell.

Explanation:

An electromagnet is simply a type of magnet where the magnetic field is produced with the help of an electric current.

In an electric bell, an electromagnet forms a very vital part alongside the armature, armature rod, spring, hammer and a gong.

Now, power that produces electric current in the electric bell is gotten when the switch for the bell is turned on.

However, hen the power that produces the electric current for the electromagnet stops, the magnetic field will stop being produced but when electric current is flowing through the coils, the electromagnet will create a magnetic field which will in turn pull the armature towards it, thereby causing the hammer to strike the bell.

Approximately .

Explanation:

Initial volume of the solution: .

Initial quantity of :

.

Ammonia reacts with hydrochloric acid at a one-to-one ratio:

.

Hence, approximately of molecules would be required to exactly react with the in the original solution and hence reach the equivalence point of this titration.

Calculate the volume of that solution required for reaching the equivalence point of this titration:

.

Hence, by the assumption stated in the question, the volume of the solution at the equivalence point would be approximately .

If no hydrolysis took place, of would be produced. Because is a soluble salt, the solution would contain of ions. The concentration of would be approximately:

.

However, because is a weak base, its conjugate would be a weak base.

.

Hence, the following reversible reaction would be take place in the solution at the equivalence point:

.

Let be the increase in the concentration of in this solution because of this reversible reaction. (Notice that .) Construct the following table:

.

Thus, at equilibrium:

.

Solve for . (Notice that the value of is likely to be much smaller than . Hence, the denominator on the left-hand side .)

.

Hence, the concentration of at the equivalence point of this titration would be approximately .

Hence, the at the equivalence point of this titration would be:

.