A question for a lab report states this: In this experiment we used a specific heat for the solution that was equal to that of water. How would you expect a salt solution to alter the specific heat of water and why? Think in terms of how the polarity of water influences the nature of water. PLEASE HELP!
As the salt concentration increases in water the specific heat decreases (see graph on first link). For pure water, the specific heat is 1.00 cal/g-C, while for a saturated NaCl solution (brine) the specific heat is 0.786 cal/g-C.
As the amount of NaCl is increased in the solution, the hydrogen bonding structure of water is disturbed. There would be less hydrogen bonding in the salt solution than in pure water. Also, much of the water will be involved with hydrating the ions, insulating them from the rest of the solution by forming a solvent sheath around them. This apparently disrupts the ability of the water to hold heat resulting in a lower heat capacity for the salt solution.
Hope this helps.
Since you get 2 solution in quadratic equations 1 may be obviously wrong. For example, if you were trying to find the number of books, -8 would obviously be wrong because you cann ot have -8 books.
It’s called an extraneous or spurious solution. See here:
http://www.mathwords.com/e/extraneous_solution.htm
Good luck in your studies,
~ Mitch ~
A laboratory employee is mixing a 10% saline solution with 4% saline solution. How much of each solution is needed to make 500 milliliters of a 6% solution?
Any help would be appreciated!
idk?
A solution of malonic acid, H2C3H2O4, was standardized by titration with 0.100M NaOH solution. IF 21.82 mL of NaOH solutions were required to neutralize completely 12.12mL of the malonic acid solution, what is the molarity of the malonic acid solution?
moles OH- = 21.82 x 0.100 / 1000 = 0.00218
Malonic acid has 2 H+ so moles of malonic acid = 0.00218/2 = 0.00109
12.12 mL = 0.01212 L
0.00109 / 0.01212 = 0.0899 M
I am sorry I have confused the issue. I have a ratio of 1:80
I need to know how much solution in millilitres, do I have to add to 3 litres of water to get a ratio of 1:80?
I need to be able to convert it to smaller/larger quantities at time.
assuming what you’re adding to water is 1:80, then it’ll be
3000mL / 80 = 37.5 mL
I have just started wearing monthly contact lenses and was given some solution to clean them and store them in overnight, and I replace the storage solution every day. Using as directed by the optician, I seem to have got through the bottle in about 10 days. Is that normal? Or am I allowed to reuse solution which was storing the already cleaned contacts in? Thanks!
Yup. ITs normal to go through them that quickly.
I’m not completely sure, but I believe that phenol red is a pH indicator. But what is indicated in case a solution containing phenol red turns red? And would this be an acid or base (and how do you determine this?)?
And similarly, what is indicated in case a solution containing phenol red turns yellow? And would this be a base or acid?
Above pH 8.2, phenol red is red/pink. Below pH 6.8, phenol red is yellow. So it is red in base and yellow in acid.
These colors are specific to the given pH indicator. You might be able to make a guess about what happens to the absorbance spectrum of a molecule on protonation/deprotonation from its structure, but these colors are in general experimentally determined. Look up the pH indicator on Wikipedia or in scientific literature to find what colors it can be.
Is there a solution? A solution which doesn’t involve wiping out the Israelis or the Palestinians I mean.
An important step would be to end US support of Israel. This is the one factor that has allowed the conflict to drag on for decades. The next thing would be to force Israel to go back to the borders set down by the UN prior to 1967, and to dismantle all Israeli "settlements" on Palestinian land. Israel has been the heavy-handed aggressor in the region for decades.
I did a school experiment, and the results came out as the seeds in the basic solution grew better then the ones in the acidic solution. and i need to know why they grow better in a base solution. of course they don’t grow better then in just water i know that.
yes MR.Hates, the previous answer definitely helpful for u but according to my view the growth of the plants always due to metabolic activities of the plants. The metabolic activities required both anabolic and catabolic system of the plants and both of this are going on by the involvement of number of chemical reaction and with the interference of the number of enzymes. As the maximum number of enzyme operate the chemical reaction within a narrow range of pH i.e mainly in alkaline medium that’s why the seeds in the basic solution grows better than the ones in the acidic solution as in the acidic solution due to presence of high percentage of acid it destroy the maximum enzyme present in the seeds and that’s why hampering in growth pattern..
How much solution could be heated to boiling by the heat evolved by the dissolution of 20.5g of NaOH? (For the solution, assume a heat capacity of 4.0 , an initial temperature of 25.0 C , a boiling point of 100.0 C, and a density of 1.05 g/ml.)
Sodium hydroxide has a lattice energy of -887 and a heat of hydration of -932 .
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