Magnesium (used in the manufacture of light alloys) reacts with iron(III) chloride to form magnesium chloride and iron. 3Mg(s) +
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pH of the solution is calculated using the following formula:
Here, is concentration of hydrogen ion.
Initial value of pH is 6.7, calculate concentration of hydrogen ion from this as follows:
Putting the value,
Thus, initial concentration of hydrogen ion is .
Now, final pH value is 8.7, calculate concentration of hydrogen ion as follows:
Thus, final concentration of hydrogen ion is .
The ratio of final to initial value will be:
Thus, if pH increases from 6.7 to 8.7, concentration of hydrogen ion becomes of the initial value.
It will take 7.5 s for the car to stop.
One of the acceleration formulas is
+at, where
is the final velocity,
is the initial velocity,
a is the acceleration, and
t is the time.
0 = 30.0 m·s⁻¹ + (-4.0 m·s⁻²)t
4.0 s⁻¹ t = 30.0
t =
= 7.5 s
One of the acceleration formulas is
a is the acceleration, and
t is the time.
0 = 30.0 m·s⁻¹ + (-4.0 m·s⁻²)t
4.0 s⁻¹ t = 30.0
t =