Answer:
a) in pure water:
⇒ S (25°C) Ni(OH)2 = 2.0 E-5 M
b) in 0.013 M NaOH:
⇒ S = 9.467 E-11 M
Explanation:
a) Ni(OH)2 ↔ Ni2+ + 2OH-
S S 2S
⇒ Ksp = [ Ni2+ ] * [ OH- ]² = 1.6 E-14.....Ksp value comes from the literature
⇒ Ksp = S * 2S² = 1.6 E-14
⇒ 2S³ = 1.6 E-14
⇒ S = ∛( 1.6 E-14 / 2 )
⇒ S = 2.0 E-5 M
b) NaOH ↔ Na+ + OH-
0.0130 M 0.013 0.013
Ni(OH)2 ↔ Ni2+ + 2OH-
S S 2S + 0.0130
⇒ Ksp = [ Ni2+ ] * [ OH- ]²
⇒ Ksp = S * (2S + 0.0130 )² = 1.6 E-14
Due to the small value of the Ksp it can be assumed that "s" is a very small number, so "2s" can be neglected when added to 0.0130.
⇒ 1.6 E-14 = S * ( 0.0130 )²
⇒ S = 9.467 E-11 M
Answer:
A. 0.064mol
B. 0.85mol
C. 1500mL
Explanation:
A. Molarity = 0.33M
Volume = 195mL = 195/1000 = 0.195L
Mole =?
Molarity = mole /Volume
Mole = Molarity x Volume
Mole = 0.33 x 0.195
Mole = 0.064mol
B. Molarity = 1.7M
Volume = 500mL = 500/1000 = 0.5L
Mole =?
Molarity = mole /Volume
Mole = Molarity x Volume
Mole = 1.7 x 0.5
Mole = 0.85mol
C. C1 = 12M
V1 = 50mL
C2 = 0.4M
V2 =?
Using the dilution formula C1V1 = C2V2, we find the volume of the diluted solution as follows:
C1V1 = C2V2
12 x 50 = 0.4 x V2
Divide both side by 0.4
V2 = (12 x 50) /0.4
V2 = 1500mL
Answer:
102kPa
Explanation:
760mmHg = 101.325 kPa
12mmHg = x
Upon converting from mmHg to kPa we have;
x = ( 12 mm Hg x 101.325 kPa) / 760mmHg
x = 1.599868421 kPa
Total pressure = 100.8 kPa + 1.599868421 kPa
Total pressure = 102kPa
A. to remove dead organisms
Explanation:
The role of the fungus is to remove dead organisms from the ecosystem.
Decomposers plays very important role in the ecosystem.
- They allow for the continuous cycling of materials there in.
- Fungus and other micro-organisms are decomposers.
- They take up the remains of other plant and animal matter and breaks them down.
- this releases nutrients back to the soil and useful gases to the atmosphere.
learn more;
Decomposers brainly.com/question/12823338
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An inefficient appliance costs less to operate than an efficient one, because it takes more energy to do the same job is "False".
<u>Answer:</u> Option B
<u>Explanation:</u>
Energy efficiency is about utilizing less energy consuming appliances than inefficient appliance which consume more energy to do the similar job and support for avoiding high energy bills and unnecessary pollution in the process.
The choice for energy efficiency is "ENERGY STAR LABEL" makes it known to consumers or businesses that a product, home or building is more energy efficient than others on the market.
ENERGY STAR and its partners have managed to save nearly 4 trillion kilowatt-hours of electricity from American families and businesses in 2017 and resulted into 3 billion metric tons of greenhouse gas reductions.
