When does boiling occur?

A student is asked to determine the molarity of a strong base by titrating it with 0.250 M solution of H2SO4. The students is in

Hoochie [10]

Answer: The concentration of hydroxide ions in the strong base solution is 0.625 M

Explanation:

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

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$ .......(1)

For sulfuric acid:

Molarity of solution = 0.250 M

Volume of solution = (30.00 - 5.00) mL = 25.00 mL

Putting values in equation 1, we get:

$0.250M=\frac{\text{Moles of sulfuric acid}\times 1000}{25.00}\\\\\text{Moles of sulfuric acid}=\frac{0.250\times 25.00}{1000}=0.00625moles$

1 mole of sulfuric acid produces 2 moles of hydrogen ions and 1 mole of sulfate ions

Moles of hydrogen ions = $(2\times 0.00625)=0.0125moles$

At pH = 7

Moles of hydrogen ions = Moles of hydroxide ions = 0.0125 moles

Now, calculating the hydroxide ions in the base solution by using equation 1, we get:

Moles of hydroxide ions = 0.0125 moles

Volume of base solution = 20.0 mL

Putting values in equation 1, we get:

$\text{Molarity of }OH^-\text{ ions}=\frac{0.0125mol\times 1000}{20.0}\\\\\text{Molarity of }OH^-\text{ ions}=0.625M$

Hence, the concentration of hydroxide ions in the strong base solution is 0.625 M

5 0

3 years ago

Give the half reactions (Reduction-Oxidation) between Zinc and Copper(II) sulfate. Indicate which one is the reducing agent.

Ray Of Light [21]

Answer:

https://www.khanacademy.org/science/chemistry/oxidation-reduction/batter-galvanic-voltaic-cell/v/redox-reaction-from-dissolving-zinc-in-copper-sulfate

Explanation:

watch the vid

7 0

2 years ago

Which of the following molecules has a double bond? A. butane B. 2-butyne C. cyclopentane D. 1-methylcyclohexene

Tanzania [10]

D. would be my guess im almost positive that its right

3 0

3 years ago

Is the H¬O bond in water nonpolar covalent, polar covalent, or ionic? Define each term, and explain your choice.

nydimaria [60]

Like hydrogen fluoride (HF), water (H2O) is a polar covalent molecule.

The electron pair in a non-polar covalent bond is shared equally by the two bonded atoms, but in a polar covalent bond, the electron pair is shared unequally by the two bonded atoms. Differences in electronegativity are what lead to polar bonding.

The entire transfer of valence electron(s) between atoms is referred to as an ionic bond. It is a kind of chemical connection that produces two ions with opposing charges. In ionic bonding, the nonmetal takes the lost electrons to form a negatively charged anion while the metal loses them to become a positively charged cation.

Learn more about Polar covalent bond here-

brainly.com/question/1646189

#SPJ4

5 0

1 year ago

If the evidence you collect during experiments does not support your hypothesis, what should happen to that hypothesis.

andreyandreev [35.5K]

Answer:

Nothing

Explanation:

Your hypothesis is the whole reason for you experiment right? What i think you should do is retrace everything you did and see if there was an error or you can just do a slight change to the experiment to see if it would make a difference.

4 0

2 years ago