Answer:
pH = 12.65
Explanation:
From the given information:
number of moles =mass in gram / molar mass
number of moles of KOH = mass of KOH / molar mass of KOH
number of moles of KOH = 0.251 g / 56.1 g/mol = 0.004474 mol
For solution :
number of moles = Concentration × volume
concetration = number of moles/ volume
concetration = 0.004474 mol / 0.100 L
concetration = 0.04474 M
We know that 1 moles KOH result into 1 mole OH⁻ ions
Therefore, Molarity of OH⁻ = 0.04474 M
Now,
pOH = -log[OH⁻]
pOH = -log (0.04474) M
pOH = 1.35
Similarly,
pH + pOH = 14
pH = 14 - pOH
pH = 14 - 1.35
pH = 12.65
Answer:
equal the number of electrons.
Explanation:
The statement that describes a question that can guide the design of a scientific investigation could be about the necessity of a controlled variable. The correct answer is A.
<h3>What is a controlled variable?</h3>
It is a variable whose values are controlled by the researcher during the course of experimental investigations.
When designing an experiment, it is necessary to identify the different variables that would be involved for a successful investigation.
Variables can be independent, dependent, controlled, or constant. Identifying the necessary variables will help in designing the experiment.
More on variables can be found here: brainly.com/question/15740935
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Answer:
Check Explanation.
Explanation:
When we are talking about the reservoirs of carbon we mean the places where carbon are been stored. So, we will be considering the places where carbon can be stored in our planet. Remember that carbon is the 6th element in the periodic table or chart.
Within these Reservoirs, the carbon moves from one to another and that is called Carbon cycle. The reservoirs of carbon can be in the atmosphere, the lithosphere and in the biosphere.
(1). Carbon can be stored in the atmosphere as Carbondioxide,CO2.
(2). Carbon can be found on lithosphere in sedimentary rock such as limestone. Also, as components in fossil fuels.
(3). Carbon can be found in the biosphere as soil carbon.
