Question

i have to determine the quantity and composition of urine
having a bath- if you were to use hot water the urine would be less and the concentration would be more
drinking a lot of beer the urine would be more and the concentration would be less
eating two bars of chocolate the urine would be less and the concentration more.

Answer 1

What a gross question. Yikes. Well, first of all, do you think that the temperature of the solution has any affect on concentration, which is a measure of how much solute is dissolved in it?

Answer 2

you lost me

Answer 3

Ok. Concentration is a way of measuring how much one kind of substance is dissolved in another kind of substance. For example, if you were making salt water by mixing salt in a cup of water, you could make a solution with low concentration by mixing in a little salt. Or you could make a solution with a high concentration by mixing in a lot of salt.

Answer 4

can we take it one question at a time. for instance the composition and quantity of urine when taking a bath

Answer 5

We are taking it one question at a time. But before we can start talking about the question, you need to understand the background science it asks about.

In this case it asks you about concentration and quality of urine. So you need to understand what concentration is. And once we're square on concentration, we'll talk about what quality means in context of urine.

Answer 6

*quantity of course, not quality. My bad of course.

Answer 7

okay so concentration is basically how much of another substance is found in another substance

Answer 8

Yes. It is. So in the context of urine in a bath tub full of water, more urine is the substance which is found in the other substance, water. So more urine = higher concentration and less urine = lower concentration.

Answer 9

you're referring to the urine in the person right when you say urine in bath tub

Answer 10

This is where I think we are not on the same page. Do I correctly interpret the question to be about a person peeing in a bath tub, which is what I mean when I say it is a gross question.

Answer 11

no. i'm referring to whether you will have more urine or less urine and whether it will be more or less concentrated after taking a bath. the bath could be hot or cold. but in this case i prefer to use after taking a hot bath

Answer 12

i say the concentration is more and the urine less. because when you sweat your body produces less urine and the urine is a darker colour because less water is present. thats my reasoning for my first answer

Answer 13

Ah, OK. Thanks. :D

With respect to temperature, we just decided above that concentration depends on the amount of solute dissolved in a solution. In light of that discussion, do you think having a hot or cold bath will have any effect on the concentration of the urine?

You could argue that the person in a cold bath has to keep themselves warm. They have to metabolise more energy to do so, and higher metabolic rates produce slightly more cellular waste products. These cellular waste products have to be gotten rid of in the urine. But in reality, unless the bath is super cold or the person is in it for days and days, this increase in metabolic rate is probably so small that it won't really change the urine in any real way.

Answer 14

You could also make an argument for swearing producing urine with less volume and higher concentration. That is a good answer too.

Answer 15

okay with the beer because beer contains yeast and yeast contains sugar the urine would be more and the concentration less because??

Answer 16

Well, through a complicated biologic pathway, alcohol also increases the amount of electrolytes (small charged molecules like sodium and potassium ions) your body looses in the urine. Your body really, really needs electrolytes. Loosing all the electrolytes in the urine after drinking alcohol is called a "hangover." And hangovers are a drag.

Answer 17

So as the amount of electrolytes in the urine increases after alcohol consumption, the solute concentration of the urine also increases. As evidence of that, I take the inevitability of hangovers after drinking alcohol (which as hard and real as anecdotal evidence gets in science).

Answer 18

so more alcohol more urine so if theres more alcohol the urine would be a lighter color

Answer 19

More alcohol, more urine, yes - but *also* increased excretion of electrolytes and other molecules your body needs in that urine. At this point the question becomes whether increase of electrolyte loss is greater than the increase in urine production, in which case the urine is more concentrated than before. Or whether the increase in electrolyte loss is less than the increase in urine production, in which case the concentration is lower.

I am curious - is this a school problem or something you're asking for personal clarification?

Answer 20

a school problem

Answer 21

Wow. My teacher never asked me questions about beer.

Answer 22

lol :P

Answer 23

ok with the chocolate bars because theres more sugar the urine will be less and the concentration more

Answer 24

Yes, that one is pretty clear.

More sugar = higher metabolic rate = more waste with no fluid input (you can't drink a chocolate bar) = more concentrated urine.

Answer 25

thanks blues you were very helpful you normally are. :)

Answer 26

Thank you for working through it. Not everyone does. And sorry I thought it was such a weird question at first.

Answer 27

not a problem