Answer:
It takes 2 hours for a police car to travel a distance of 29 miles with 58 miles per hour.
Explanation:
The speed of the car is 58 miles per hour.
The total distance traveled is 29 miles.
We need to find the time taken to cover the distance of 29 miles by the police car if police traveled at 58 miles per hour.
We know that,
Relationship between speed, time and distance is ![speed=\frac{distance}{time}](https://tex.z-dn.net/?f=speed%3D%5Cfrac%7Bdistance%7D%7Btime%7D)
Now substitute the given values in the above formula,
![58=\frac{29}{time}](https://tex.z-dn.net/?f=58%3D%5Cfrac%7B29%7D%7Btime%7D)
![time=\frac{29}{58}](https://tex.z-dn.net/?f=time%3D%5Cfrac%7B29%7D%7B58%7D)
Time = 2 hours.
The answer to your question is A
POH can be calculated by the negative logarithm of [OH⁻] .
pOH = -log [OH⁻]
pH scale is used to determine how acidic/ neutral or basic a solution is. By knowing the pOH the pH can be calculated, as;
pH + pOH = 14
pH = 14 - pOH
dissociation of Ba(OH)₂ is as follows;
Ba(OH₂) ---> Ba²⁺ + 2OH⁻
1 mol Ba(OH₂) dissociates into 2 OH⁻ moles
Therefore molarity of OH⁻ is twice as much as the molarity of Ba(OH₂).
[OH⁻] = 2 x 2.80 M
= 5.6 M
pOH = -log 5.6
= -0.75
pH = 14 - - 0.75
= 14.75
when the pOH is a negative value this means that the pH is greater than 14.
Usually pH scale is from 1-14, with 1 being very acidic and 14 being very basic. Since pH is greater than 14 this means that the solution is strongly basic.