What is the covalent compound name for HO3

Do you think crystals formed in conditions that were stable or did they change often?

andreev551 [17]

Answer:

They were made in unstable conditions

Explanation: Im smarty pants

6 0

3 years ago

A buffer with a pH of 4.31 contains 0.31 M of sodium benzoate and 0.24 M of benzoic acid. What is the concentration of [ H 3 O ]

Mnenie [13.5K]

Answer: The hydronium ion concentration in the solution is $1.29\times 10^{-4}M$

Explanation:

To calculate the molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles hydrochloric acid solution = 0.060 mol

Volume of solution = 1 L

Putting values in above equation, we get:

$\text{Molarity of HCl}=\frac{0.060}{1L}\\\\\text{Molarity of HCl}=0.060M$

The chemical reaction for aniline and HCl follows the equation:

$C_6H_5COO^-+HCl\rightarrow C_6H_5COOH+Cl^-$

Initial: 0.24 0.060 0.31

Final: 0.18 - 0.37

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a+\log(\frac{[\text{conjugate acid}]}{[\text{base}]})$

$pH=pK_a+\log(\frac{[C_6H_5COO^-]}{[C_6H_5COOH]})$

We are given:

$pK_a$ = negative logarithm of acid dissociation constant of benzoic acid = 4.2

$[C_6H_5COO^-]=0.18M$

$[C_6H_5COOH]=0.37M$

pH = ?

Putting values in equation 1, we get:

$pH=4.2+\log(\frac{0.18}{0.37})\\\\pH=3.89$

To calculate the hydronium ion concentration in the solution, we use the equation:

$pH=-\log[H_3O^+]$

pH = 3.89

Putting values in above equation, we get:

$3.89=-\log[H_3O^+]$

$[H_3O^+]=10^{-3.89}=1.29\times 10^{-4}M$

Hence, the hydronium ion concentration in the solution is $1.29\times 10^{-4}M$

3 0

3 years ago

A ballerina weighs 103 lbs and is up on her toes with only 10.0 cm2 of her slippers in contact with the floor. What pressure is

Ahat [919]

Answer:

A

Explanation:

1 lb = .453 kg...so...103 x .453 = 46.72 kg

you then multiply that by the force of gravity which is 9.8(m/s2)...so...

46.72 x 9.8 = 458 newtons(kg x m/s^2), which is the force.

pressure (in pascals) = Force(N) / Area (m2)

we need to convert 10cm2 to m2 which = .001m^2

458 / .001 = 458000 = 4.58 x 10^5 Pa

8 0

3 years ago

Read 2 more answers

before the quarry was dug, the land contained more vegetation . what impact has this change most likely had on the local ecosyst

Sergio039 [100]

It was loss of nutrients, I think

Explanation:

The quarry was dug up and vegetation started dying. The quarry was probably rich with nutrients

Please brainliest !! ❤️

5 0

3 years ago

Can anyone give me tips on how to present 4-6 mark questions in science assessments? I understand the logic but I find it hard t

Vlad1618 [11]

Answer:

- start by recycling the question

- explain the topic using key words related to that topic

- include a few examples/data if it's using a graph/photo

5 0

3 years ago