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solong [7]
3 years ago
10

14.

Chemistry
1 answer:
IceJOKER [234]3 years ago
7 0

Answer:

a    CH2

Explanation:

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A calcium atom (Ca) will lose or gain electrons
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To become an ion a calcium atom would have to lose 2 electrons.
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A buffer is prepared by adding 150mL of 0.50 M NH3 to 250mL of 0.50 M NH4NO3. What is the pH of the final solution? (Kb for NH3
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From the calculations, the pH of the final solution is 9.04.

<h3>What is the pH of the buffer?</h3>

We can use the Henderson Hasselbach equation to obtain the final pH of the solution in terms of the pKb and the base concentration.

Number of moles of salt = 250/1000 L * 0.5 M = 0.125 moles

Number of moles of base = 150/1000 L * 0.5 M = 0.075 moles

Total volume of solution = 250ml + 150ml = 400ml or 0.4 L

Molarity of base = 0.075 moles/ 0.4 L = 0.1875 M

Molarity of salt = 0.125 moles/ 0.4 L = 0.3125 M

pOH = pKb + log[salt/base]

pKb = -log(1.8 x 10^-5) = 4.74

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pOH = 4.96

pH = 14- 4.96

pH = 9.04

Learn more about pH:brainly.com/question/15289741

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2 years ago
Why is it important to living things that water is bonded by h bond and not by covalent or ionic one
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3 years ago
What is the main difference between vascular and nonvascular plants? the ability or inability to perform photosynthesis the pres
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Vascular plants are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant. Non-vascular plants are plants mostly found in damp and moist areas and lack specialized vascular tissues. Vascular plants are also known as tracheophytes.

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A person's heartbeat is 71 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does th
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First step: identify how many heart beats in a year.

To determine the heart beats in a year multiply the heart  beats in a minute with (60\times 24\times 365) years.  

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Heart beats 3.1\times 10^{9} in a life time.

Thus, number of years he lives is calculated by the division of  heart beats in a year and heart beats in a life time.

Number of years he lives = \frac{3.1\times 10^{9}}{37317600}

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