The pH at which bromothymol blue be a perfect green color is; pH = 6.8
<h3>What is the PH?</h3>
For Bromothymol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.
From Henderson-Hasselbalch formula, we known that:
pH = pka + log [X⁻]/[HX] (1)
Where pka = -log ka = -log(1.6 × 10⁻⁷) = 6.8
Since HX = X⁻, [HX]/[X⁻] = 1
Thus;
pH = 6.8 + log 1
pH = 6.8 + 0
pH = 6.8
Read more about pH of solution at; brainly.com/question/13011143
Answer:
The set of input values is called the domain.
The speed of the boat in still water if the speed of the current is 1.5mph is equal to 7.5mph.
<h3>Solution:</h3>
We have to define the terms in this question
We have Sc = Speed of the current = 1.5mph
We have Sb = Speed of the boat in the still water
We have this equation:
Sb + Sc = 1.5(Sb - Sc)
Sb + Sc = 1.5Sb - 1.5Sc
We have to collect the like terms
Sb - 1.5Sb = -1.5Sc - Sc
-0.5Sb = -2.5Sc
We divide through this equation by the value of Sb
Sb = 5Sc
Given that the speed of current Sc = 1.5. then
Sb = 5*1.5
Sb = 7.5
<em>In conclusion</em><em>, the speed of the boat in still water at 1.5mph = </em><em>7.5mph</em>
Read more on the speed of the current here:
brainly.com/question/908856
Focus on what the teacher says and read what's on the board
Answer:
10 m/s²
Explanation:
Near Earth's surface, gravitational acceleration is approximately 9.81 m/s2, which means that, ignoring the effects of air resistance, the speed of an object falling freely will increase by about 9.81 metres per second every second.