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4 years ago

ASAP!!!!

Chemistry

1 answer:

11Alexandr11 [23.1K]4 years ago

8 0

The answer is Copper. Copper is one of the transition metals on a periodic table.
*Sorry It Took So Long*

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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]

<u>Answer:</u> The pH of the solution is 12.9

<u>Explanation:</u>

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

When was helium discoved?

andrey2020 [161]

It was discovered in 1868.i hope this helps you .

4 0

4 years ago

How much water should be added to 4.3 moles of LiBr to prepare a 2.05 m solution?

arsen [322]

Answer:

2.1 kg of water

Explanation:

Step 1: Given data

Moles of lithium bromide (solute): 4.3 moles

Molality of the solution (m): 2.05 m (2.05 mol/kg)

Mass of water (solvent): ?

Step 2: Calculate the mass of water required

Molality is equal to the moles of solute divided by the kilograms of solvent.

m = moles of solute/kilograms of solvent

kilograms of solvent = moles of solute/m

kilograms of solvent = 4.3 mol /(2.05 mol/kg) = 2.1 kg

8 0

3 years ago

1. How much NaCl would you need to weigh out to prepare 100 mL of a 2.5% NaCl<br> solution?

Ira Lisetskai [31]

<h3><u>Answer</u> - 5.85g</h3>

<h3><u>Solution</u> - </h3>

Using the concentration equation, m = CVMo where m is the mass of solute, C is the concentration (M), V is the volume of solution (L) and Mo is molar mass of the solute (g):

Given,

Molar mass of NaCl, M = 58.5g/mol

Volume of the solution, V= 100ml = 0.1L

Molarity, S= 1M

Mass of the solute,W=?

W=SMV

= 1×58.5×0.1

= 5.85g

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2 years ago

Which sentence uses the positive form of an adverb?

kenny6666 [7]

The answer is A. Mom carefully bandaged my finger.

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4 years ago