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3 years ago

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Chemistry

1 answer:

sweet [91]3 years ago

5 0

Answer:

no questions

it's just all dots here

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What is the pH of a solution with [H+]2.3 x 10^-9 ? a. -9.00B.-8.64C. 9.00D.8.64?

Assoli18 [71]

pH can be defined as negative logarithm of hydronium ion concentration .

pH can be mathematical represented as :

pH =-log [H+]

[H+]=2.3*10^-9

pH= -log[2.3*10^-9]

=8.64

5 0

4 years ago

Read 2 more answers

A chemist dissolves 697. mg of pure potassium hydroxide in enough water to make up 160. mL of solution. Calculate the pH of the

umka21 [38]

Answer: The pH of the solution is 12.9

Explanation:

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

Given mass of KOH = 697 mg = 0.697 g (Conversion factor: 1 g = 1000 mg)

Molar mass of KOH = 56 g/mol

Volume of solution = 160 mL

Putting values in above equation, we get:

$\text{Molarity of KOH solution}=\frac{0.697\times 1000}{56\times 160}\\\\\text{Molarity of KOH solution}=0.0778M$

1 mole of KOH produces 1 mole of $K^+$ ions and 1 mole of $OH^-$ ions

To calculate the pOH of the solution, we use the equation:

$pOH=-\log[OH^-]$

We are given:

$[OH^-]=0.0778M$

Putting values in above equation, we get:

$pOH=-\log (0.0778)=1.11$

To calculate pH of the solution, we use the equation:

$pH+pOH=14\\pH=14-1.11=12.89$

Hence, the pH of the solution is 12.9

5 0

3 years ago

Definition: This is a change in velocity per time.

ladessa [460]

Answer: acceleration

a = 5.36 m/s²

Explanation: solution attached:

Convert first 60 mi/h to m/s

Use the formula for acceleration

a = vf - vi /t

8 0

3 years ago

IF YOU GIVE A LINK OR DON"T ACTUALLY ANSWER THIS QUESTION RIGHT JUST FOR POINTS I WILL REPORT YOUR ANSWER AND YOU

mariarad [96]

Answer:

$__________ is a set of _____ or combination of __________ alleles responsible for an _________ of a trait.$

Explanation:

6 0

3 years ago

When vinegar and baking soda are combined bubbles begin to form. Bubbles are evidence of a chemical reaction because they

Varvara68 [4.7K]

Answer:

bubbled

Explanation:

its simple they bubbled

signs of chemical reactions are change of

odor

bubbles

solid turns liquid

liquid turns solid

change of color

7 0

3 years ago