ilvvsShatalov3984
06.11.2019 •
Chemistry
Achemist must prepare 900.0ml of potassium hydroxide solution with a ph of 13.80 at 25°c. he will do this in three steps: fill a 900.0ml volumetric flask about halfway with distilled water. weigh out a small amount of solid potassium hydroxide and add it to the flask. fill the flask to the mark with distilled water. calculate the mass of potassium hydroxide that the chemist must weigh out in the second step. round your answer to 2 significant digits.
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Ответ:
The chemist needs 39 grams of potassium hydroxide
Explanation:
Step 1: Data given
Volume = 900 mL = 0.9 L
pH = 13.80
Temperature = 25 °C
Step 2: Calculate pOH
pH + pOH = 14
pOH = 14 - 13.80 = 0.20
Step 3: Calculate [OH-]
pOH = 0.20 = -log[OH-]
[OH-] = 10^-0.20
[OH-] = 0.631
Step 4: calculate moles of KOH
KOH is a strong base, this means [OH-] = [KOH]
[KOH] = moles KOH / volume KOH
moles KOH = [KOH]/ volume KOH
moles KOH = 0.631 / 0.9 L
moles KOH = 0.701 moles
Step 5: Calculate mass of KOH
mass KOH = Number of moles KOH * Molar mass KOH
mass KOH = 0.701 moles * 56.106 = 39.33 grams ≈ 39 grams
The chemist must weight out 39 grams of potassium hydroxide
Ответ:
The answer is 814.5 :
There is 3258 calories in one pound of margarine (according to google)
one-fourth= 0.25
0.25*3258= 814.5 calories