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aleksandrvk [35]
3 years ago
12

The Ka for acetic acid (HC2H3O2) is 1.80 x 10-5 . Determine the pH of a 0.0500mol/L acetic acid solution.

Chemistry
1 answer:
TiliK225 [7]3 years ago
8 0

Answer:

pH = 3.02

Explanation:

Acetic Acid is a weak acid (HOAc) that ionizes only ~1.5% as follows:

HOAc ⇄ H⁺ + OAc⁻.

In pure water the hydronium ion concentration [H⁺] equals the acetate ion concentration [OAc⁻] and can be determined* using the formula [H⁺] = [OAc⁻] = SqrRt(Ka·[acid]) = SqrRt(1.8x10⁻⁵ x 0.0500)M = 9.5x10⁻⁴M.

By definition, pH = -log[H⁺] = -log(9.5x10⁻⁴) = 3.02

______________________________________________________

*This formula can be used to determine the [H⁺] & [Anion⁻] concentrations for any weak acid in pure water given its Ka-value and the molar concentration of acid in solution.

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son4ous [18]
N2+3H2= 2NH3

Stoichiometry: 1 mole of N2 + 3 moles of H2 yield 2 moles of ammonia, let's put that into grams; 28g (14g/mol∗2mol) of N2 and 6.06g(1.01g/mol∗2∗3mol)

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3 0
3 years ago
Read 2 more answers
Sandra heated a 12.3-g piece of iron to 100oC. She then placed the iron in a calorimeter with a heat capacity of 10.4 J/oC. The
Thepotemich [5.8K]
We first have to find Q calorimeter

Q calorimeter = C (delta T) 

C= heat capacity in J/oC, not small c ( specific heat capacity) 
delta T= change in T (oC) = final T - initial T 

Q calorimeter = 10.4 J/oC (30 oC - 25 oC)
Q calorimeter = 52 J 

Remember, 

Q calorimeter = - Q surrounding
The (-) negative sign stands for heat being released. 

So , 

Q surrounding = - 52 J 

In other words, the iron releases 52 J .

The calorimeter absorbs the entire 52 J and heat rose from 25 - 30 oC. 

Answer: 52 J


8 0
3 years ago
What is the mass number for an atom with 5 protons 6 neutrons and 5 electrons
mash [69]

Answer:

10.811 atomic mass unit

Explanation:

5 0
3 years ago
Calculate the specific heat capacity for a 15.3-g sample of gold that absorbs 87.2 J when its temperature increases from 35.0 °C
diamong [38]

Answer:

The specific heat of gold is 0.129 J/g°C

Explanation:

Step 1: Data given

Mass of gold  = 15.3 grams

Heat absorbed = 87.2 J

Initial temperature = 35.0 °C

Final temperature = 79.2 °C

Step 2:

Q = m*c*ΔT

⇒ Q =the heat absorbed = 87.2 J

⇒ m = the mass of gold = 15.3 grams

⇒ c = the specific heat of gold = TO BE DETERMINED

⇒ ΔT = The change in temperature = T2 - T1 = 79.2 - 35.0 = 44.2 °C

87.2 J = 15.3g * c * 44.2°C

c = 87.2 / (15.3 * 44.2)

c = 0.129 J/g°C

The specific heat of gold is 0.129 J/g°C

4 0
3 years ago
What is the speed of a cheetah that runs 30 miles in 0.5 hours?<br> a
REY [17]

Answer:

60 mph (miles per hour)

Explanation:

0.5 hours is 1/2 of an hour, so to get the number of miles for a whole hour you multiply the miles ran by 2.

30 times 2 is 60.

6 0
2 years ago
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