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bixtya [17]
3 years ago
11

What is friction force ?

Chemistry
1 answer:
Degger [83]3 years ago
5 0
What is the resistance to motion
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A chemist dissolves of pure potassium hydroxide in enough water to make up of solution. Calculate the pH of the solution. (The t
Leya [2.2K]

Answer:

12.99

Explanation:

<em>A chemist dissolves 716. mg of pure potassium hydroxide in enough water to make up 130. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits.</em>

Step 1: Given data

  • Mass of KOH: 716. mg (0.716 g)
  • Volume of the solution: 130. mL (0.130 L)

Step 2: Calculate the moles corresponding to 0.716 g of KOH

The molar mass of KOH is 56.11 g/mol.

0.716 g × 1 mol/56.11 g = 0.0128 mol

Step 3: Calculate the molar concentration of KOH

[KOH] = 0.0128 mol/0.130 L = 0.0985 M

Step 4: Write the ionization reaction of KOH

KOH(aq) ⇒ K⁺(aq) + OH⁻(aq)

The molar ratio of KOH to OH⁻is 1:1. Then, [OH⁻] = 0.0985 M

Step 5: Calculate the pOH

We will use the following expression.

pOH = -log [OH⁻] = -log 0.0985 = 1.01

Step 6: Calculate the pH

We will use the following expression.

pH + pOH = 14

pH = 14 - pOH = 14 -1.01 = 12.99

8 0
2 years ago
What is the structure of beeswax that contains 16 carbon of carboxylic acid and 30 carbon of alcohol?
melisa1 [442]
This is the answer hope this helps

7 0
3 years ago
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What element behaves MOST like magnesium (Mg)?<br> A) S <br> B) Si <br> C) Sn <br> D) Sr
tatyana61 [14]

Strontium (Sr). Elements in the same group of the periodic table have similar characteristics.

3 0
3 years ago
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How do electrostatic forces affect the electrons in an atom?​
svlad2 [7]

Answer:

allows the atoms of different elements to bond together to form new substances

8 0
2 years ago
How many atoms are in a sample of 1.83 moles of potassium (K) atoms? Please explain the conversions to me. Thank you!
IRINA_888 [86]
1 mole K ------------- 6.02x10²³ atoms
1.83 moles K ------ ?? atoms

1.83 x (6.02x10²³) / 1 =

1.101x10²⁴ atoms of K

hope this helps!
6 0
3 years ago
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