Answer:
Doing experiments by scientific procedures is advantageous and helpful.
Explanation:
The scientific procedure should be followed while performing a experiment as it has many advantages like:
- Working in safe environment: Performing a experiment by scientific procedure ensures the safety of the experimenter.
- It reduces the chances of mistakes: The proper availability of the scientific equipment helps in reduction of the chances of the mistakes.
- A sequence of steps is followed: A proper sequence of steps is followed to perform a experiment step by step. Performing experiment without scientific procedure may cause the experimenter to forgot a step.
- More Accuracy: The readings of the experiment is more accurate by doing experiment by scientifically.
- Chemical changes can be observed: The physical and chemical changes can be observed and can be measured by the lab equipment to perform more accurately.
- less chance of risks: Performing in the safe scientific environment and using proper safety equipment reduces the chances of risks to the experimenter.
The ph of a saturated solution of Ca(OH)2 is 12.35
CALCULATION:
For the reaction
Ca(OH)2 → Ca2+ + 2OH-
we will use the Ksp expression to solve for the concentration [OH-] and then use the acid base concepts to get the pH:
Ksp = [Ca2+][OH-]^2
The listed Ksp value is 5.5 x 10^-6. Substituting this to the Ksp expression, we have
Ksp = 5.5 x 10^-6 = (s) (2s)^2 = 4s^3
s3 = 5.5x10^-6 / 4
Taking the cube root, we now have
s = cube root of (5.5x10^-6 / 4)s
= 0.01112
We know that the value of [OH-] is actually equal to 2s:
[OH-] = 2s = 2 * 0.01112 = 0.02224 M
We can now calculate for pOH:
pOH = - log [OH-]
= -log(0.02224)
= 1.65
Therefore, the pH is
pH = 14 - pOH
= 14 - 1.65
= 12.35
Explanation:
Your chemical equation should look like this:
Li3PO4 + AlF3 --> 3LiF + AlPO4
This is the balanced equation for a double-displacement reaction
Answer:
1.67 M
Explanation:
75.0 g *1 mol/180 g = (75/180) mol of glucose
250 mL = 0.250 L
(75/180)/0.250 = 1.67 mol/L =1.67 M
