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myrzilka [38]
3 years ago
11

Question 1 a chemist dissolves 154.mg of pure hydrochloric acid in enough water to make up 170.ml of solution. calculate the ph

of the solution. be sure your answer has the correct number of significant digits
Chemistry
1 answer:
Nina [5.8K]3 years ago
3 0
HCl is a strong acid and completely dissociates to give out H⁺ ions
Therefore [HCl] = [H⁺] 
number of HCl moles - 154 x 10⁻³ g/ 36.5 g/mol = 4.22 mmol 
[HCl] = 4.22 x 10⁻³ mol / 0.170 L = 0.025 M
therefore [H⁺] = 0.025 M
by knowing the H⁺ concentration, pH can be calculated
pH = -log[H⁺]
pH = -log (0.025 M)
pH = 1.60 
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2 years ago
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Given the following equation: 2K + Cl2 -&gt; 2KCl How many grams of KCl is produced from 4.00 g of K and excess Cl2?
Thepotemich [5.8K]

Answer:

42.65g

Explanation:

Given parameters:

Mass of K = 4g

Unknown: Mass of KCl

Solution:

  Complete equation of the reaction:

              2K + Cl₂ → 2KCl

To solve this problem, we know that the reactant in short supply is potassium K and this dictates the amount of products that would be formed. The chlorine gas is in excess and we can't use it to determine the amount of product that would form.

Now, we work from the known to the unknown. Since we know the mass of K given in the reaction, we can simply find the molar relationship between the reacting potassium and the product. We simply convert the mass to mole and compare to the product. From there we can find the mass of KCl that would be produced.

Calculating number of moles of K

      Number of moles = \frac{mass}{molar mass}

        Number of moles of K =  \frac{4}{39} = 0.103mol

From the given reaction equation:

   2 moles of K will produce 2 moles of KCl

 Therefore 0.103mol of K will produce 0.103mol of KCl

To find the mass of KCl produced,

   Mass of KCl = number of moles of KCl x molar mass

Molar mass of KCl = 39 + 35.5 = 74.5gmol⁻¹

Mass of KCl = 0.103 x 74.5 = 42.65g

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3 years ago
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Determine the number of molecules in a 100. gram sample of CCl4
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(Note that the units cancel out so you get the answer)

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Small molecules that bind with self-proteins to produce antigenic substances are called ________. Small molecules that bind with
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Answer:

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Haptens are used to study the mechanism of inflammatory bowel disease to help induce the autoimmune type of responses and allergic contact dermatitis.

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ExtremeBDS [4]

Answer:

C5H5N is the base and C5H5NH+ is the conjugate acid

H2O is the acid and OH− is the conjugate base

Explanation:

<u>Hydrogen + is also called a proton</u>

C5H5N is the base because it receives the proton (H+) and C5H5NH+ is its conjugate acid

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Answer:

HNO3 is the acid and NO3- is the conjugate base

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