1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
gayaneshka [121]
2 years ago
5

Calculation: If you have a pH of 5.5 for a weak acid with a pKa of 4.76, then is there more A- or more HA in the solution? Expla

in why in words using your knowledge of positive or negative log numbers.
Chemistry
2 answers:
devlian [24]2 years ago
6 0

Answer:

lets set the ratio -A/HA as R:

pH = pKa + log(R,10) => pKa + log10(R)

pH = 5.5

pKa = 4.76

R => 10^(pH - 4.76)

10^(pH - 4.76) => 5.4954

Given R (-A/HA) a number bigger than 1, then the concentration of  -A is bigger than HA

Explanation:

meriva2 years ago
6 0

Answer:

There is more A⁻ than HA in the solution  

Explanation:

The equation for the ionization of a weak acid is

HA + H₂O ⇌H₃O⁺ + OH⁻

When HA and A⁻ are present in comparable amounts, we can use the Henderson-Hasselbalch equation:

\begin{array}{rcl}\text{pH} &=& \text{pK}_{\text{a}} + \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\\5.5 & = & 4.76 + \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\\0.74 & = & \log\dfrac{[\text{A}^{-}]}{\text{[HA]}}\\\end{array}

0.74 is a positive number, and a number must be greater than one for its logarithm to be positive. That is,

\begin{array}{rcl}\dfrac{[\text{A}^{-}]}{\text{[HA]}} & > & 1\\\\\textbf{[A]}^{-} & > & \textbf{[HA]}\\\end{array}

You might be interested in
1. How many molecules of H,O are in 4.32 moles?
Korvikt [17]

Answer:

dont know

Explanation:

8 0
3 years ago
As the speed of a particle increases, does its associated wavelenght increase or decrease
Zina [86]

The de Broglie hypothesis proposed that all particles have wave-like properties, with the wavelength being inversely proportional to the velocity of the particle.


Therefore as the velocity (speed in this question) increases, the wavelength *decreases*.

7 0
3 years ago
Are people made up of matter? Do they have mass?
GaryK [48]
Yes. Everything is made up of mass. If it takes up space, it has mass
3 0
3 years ago
i’m in desperate need of help haha. btw it’s 200 ml of a clear liquid and 50 ml of a different clear liquid. please help
Lelu [443]
C. a chemical reaction occurred when the two liquids were mixed
6 0
3 years ago
By definition, all acids are harmful for human beings. true or false
bixtya [17]

Answer:

true

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • PLEASE HELP ASAP!!! 25 POINTS AND BRAINLIEST FOR FASTEST AND BEST ANSWER!!!
    12·1 answer
  • How many milliliter are in 0.063 L
    14·2 answers
  • How many molecules of nitrogen monoxide are in a 22.5 gram sample?
    10·1 answer
  • Write a balanced chemical equation, including physical state symbols, for the decomposition of solid calcium carbonate (CaCO₃) i
    5·1 answer
  • Why is there a vast amount of salt water on Earth?
    9·1 answer
  • 12. How are secondary sources of energy different from other energy resources?
    5·1 answer
  • Which molecular formula is also an empirical formula? <br> 1)C6h6<br> 2)h2o2<br> 3) n2h4<br> 4) n2o5
    13·2 answers
  • Carbon disulfide is formed by the reaction of coke (carbon) with sulfur dioxide. how many moles of cs2 will be generated if 8.0
    5·1 answer
  • The levels of organizations in multicellular organisms are shown below, but they are not in the correct order. Arrange the level
    15·1 answer
  • What was the name of JJ. Thomson's experiment?
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!