Help Zone

TomateSupra7536

Hi!

I have an exercise that asks me to determine the mass of sodium hydroxide (NaOH) in a basic solution by titrating it with a 1.8 mol / L acidic solution. The titration shows a neutralization volume of 30 mL for the acid and an initial volume of 20 mL for the base. I am not sure how to find the mass.

TomateSupra7536

Hi!

I'm not sure if I understand how a titration can help us to know the concentration of a solution ... Can someone explain it to me please?

Thank you very much in advance!

TomateSupra7536

Hi! I'm not sure I understand how pH works.

Is the higher, the more acidic?

And if for example I have a solution with a pH of 4 and another with a pH of 8, is the second solution twice as acidic as the first?

Thank you for your help!!

TomateSupra7536

I have a hard time understanding how why ° C is used in the thermal energy equation Q = m * c * delta T. In many chemistry exercises, we have to use Kelvin. Thank you

FairTangerine2097

Hello,

I have a hard time understanding how an acid-base neutralization is done in a lab. Could you explain it to me please?

Thank you so much!

FairTangerine2097

How do the different characteristics of the elements change in the periodic table?

FairTangerine2097

Hello, I do not understand the principle of a titration

TomateSupra7536

Hi, I don't understand half life ???

SkillfulGrasshopper3789

Hello! I'm not sure if the Q in Q = m * c * ∆T means the heat or thermal energy?

Also, when is the Q positive and negative?

Thanks in advance :)

TomateSupra7536

Hello,

Could you explain to me what are the differences between the families of the periodic table please?

Thank you so much!

TomateSupra7536

Hello!

Can 2 elements have the same atomic number? Thank you :)

TomateSupra7536

Hello!

I was wondering, is there a particular order in the periodic table? Because from left to right and from top to bottom the number in the box starts from 1 and goes up, but does this number mean something or is it a reference number that has been set randomly? Thanks for your time :))

TomateSupra7536

Hi!

I was reviewing and trying to remember how to find the number of protons, electrons and neutrons in an atom? (I will put an example below) Thank you !!!

$$ _{92}^{235}U $$

SkillfulGrasshopper3789

How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!

SkillfulGrasshopper3789

Ok, I understand that in an acid-base neutralization, we mix an acid and a base in a solution, but I don't understand how the pH becomes neutral again after ...? Can you explain this to me please?

SkillfulGrasshopper3789

Hello again :)

Ok if I have a solution where I have to use colorimetric indicators, how do I use several at the same time to know the pH approximately? Do I simply combine them?

thank you

SkillfulGrasshopper3789

Hi!

If a solution is alkaline, is it acidic or basic? Thanksss

SkillfulGrasshopper3789

Hi again!

What does “ph is measured on a logarithmic scale” mean ????

SkillfulGrasshopper3789

hi!

Why can several pH indicators be used in an experiment? How can the appropriate one be determined? Thank you :))

FairTangerine2097

Hello,

Could you explain to me what the molar mass is? I can't quite understand.

Thank you so much!

FairTangerine2097

Helloo, what is the difference between a mole and the Avogadro number?

Thank you!

FairTangerine2097

Hello,

I have trouble differentiating between exothermic and endothermic reactions according to their enthalpies. Do you have any tips or summaries?

FairTangerine2097

Hello,

I am having difficulty understanding how the thermal energy formula works. Could you explain to me, please?

Thank you so much!

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