# What happened if you put the Elodea leaf cells in a solution of 0.5% NaCl,1.8% NaCl and 0.9%NaCl?

36,754 questions, page 248-
## Chemistry

What volume (mL) of the solute ethanol should be combines with 2.44L of the solvent H2O to prepare a solution that is 8.03m ethanol?

*asked by Lisa on June 6, 2010* -
## physiology

how many grams of glucose (180grams/mole) to make a 13% glucose solution with a final volume of 600 milliters.

*asked by sam on February 20, 2017* -
## chemistry

If K = 1.8 x 10 for HC2H3O (aq) H+(aq)+C2H3O2-(aq), and 100 mL of aqueous solution has [HC2H3O2] = 0.50 M, [H+] = 0.090 M, and [C2H3O2-] 0.0010 M, is the system at equilibrium?

*asked by alexis on July 27, 2008* -
## calculus

If 0 degrees < x < 180 degrees, what values of x, to the nearest degree, are the solution to the equation 2tan to the square x + 5tanx - 12 = 0

*asked by John on March 7, 2012* -
## Chemistry

What volume (mL) of the solvent benzene should be added to 142 mL of the solute CH3CN to generate a solution that is 2.68% by mass CH3CN?

*asked by Scott on September 2, 2008* -
## chemistry

What is the molality of a solution composed of 25ml og toluene C6H5CH3 ( density=0.866g/ml) in 75 ml of benzene ( density=0.879g/ml)

*asked by gabriela on April 10, 2017* -
## Chemistry

How do I calculate number of moles of K2C2O4 in 20mL of a saturated (300g K2C2O4.H2O per liter) solution....

*asked by Chan on September 16, 2010* -
## Trigonometry (Coterminal Angles)

What is the SMALLEST POSITIVE ANGLE that is coterminal with the angle having the radian measure of -10π/3? Is there any solution for this kind of question?

*asked by Bryle on February 20, 2015* -
## Maths

By making the substitution u =ln x show that the following equation has exactly one real-number solution: 9/ln x + ln x^4 =-12 Sorry wrote the incorrect equation previously!

*asked by Lauren on October 27, 2016* -
## Chem

I did an experiment for creating an ester. So basically I added an acid to an alcohol. We were to also add H2SO4 solution. Why did we add that?

*asked by Lena on March 25, 2009* -
## HELPPPPPPP (TRIG)

find, to the nearest minute, the solution set of 1- sin x = 3 cos^2 x over the domain 0 degrees to 360 degrees

*asked by HELPPPP on May 20, 2010* -
## science

a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample

*asked by Nikita on February 11, 2016* -
## Chemistry

how many grams of CaCl2 would be required to be added to water to prepare 1 liter (1000 ml) of a 1.72% (w/v) aqueous solution of CaCl2?

*asked by Tia on April 27, 2011* -
## ALGEBRA

I also have an answer for this one. Just need to be sure. Says to solve then graph. x +9>2; x + 9 - 9> 2 - 9 x > - 7. I believe this means anything to the right of -7 could be a solution. I would graph this with an open circle at -7 and shade to the right

*asked by Jessica 2 on November 4, 2010* -
## Math

A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

*asked by Bob on April 26, 2013* -
## chem

How many grams of CaCl2 would be required to be added to water to prepare 1 Liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?

*asked by ALEX9 on April 25, 2011* -
## math

Which of the values is in the solution set for the inequality -8-7x>6 It is multiple choice A=-1 b=-2 c=-3 d=2 I did this: -8-7x>6 add 8 to each side -7x>14 -7/-7>14/-7 x

*asked by b6 on January 4, 2013* -
## chemistry

A 0.500M solution of a weak acid, HX, is only partially ionized. The [H+] was found to be 4.02 x 10^-3 M. Find the dissociation constant for this acid.

*asked by kayla on August 5, 2008* -
## chemistry

calculate the hydroxide ion concentration in a solution of almond extract PH.3.8.state if almond is basic or acid

*asked by demi on April 25, 2013* -
## chemistry

A 100.0 ml aqeuous solution that contains 0.50 g of hemoglobin has an osmotic pressure of 0.00178 atm. What is the molar mass of hemoglobin?

*asked by victoria on February 16, 2015* -
## chemistry

what is the freezing point of a solution that contains 20.2g of urea CO(NH2)2 in 295mL water? Assume a density of water of 1.00g/mL

*asked by jennifer on June 14, 2015* -
## Math

A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

*asked by Bob on April 26, 2013* -
## Math

A polymomial p(x) = ax^2 + bx + c where a, b, c are some rational, has 1 + root 3 as one of the zeros and also p (2) = - 2, Find values of a, b and c. Please work the solution. Tried it many times but still can't get the answer/ The answer is a = 1, b = -2

*asked by Bob on April 26, 2013* -
## Math

One of two similar triangles has an area of 1/4 times that of the other. What is the ratio of its perimeter of the triangles? (I know the answer but I don't know the solution, please explain. Thank you very much!!)

*asked by Anonymous on February 22, 2015* -
## Please HELP CHEM

How many grams of CaCl2 would be required to be added to water to prepare 1liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?

*asked by Tina on April 28, 2011* -
## science

a solution containing 4.2g KOHand Ca(OH) 2 is neutralized by an acid. it consumes 0.1 equivalent of acid, calculate the percentage composition of the sample

*asked by Anonymous on February 11, 2016* -
## chemistry

Calculate the mass of sodium phosphate required to prepare 1.75 L of solution in which the sodium ion concentration is 0.25 mol/L

*asked by Zilly on January 8, 2015* -
## Chemistry

What is the pH of a 0.051 M solution of Phosphorous acid (H2PHO3) in water? The value of Ka1 for H2PHO3 is 1.600 x 10-2 and the value of Ka2 is 7.000 x 10-7.

*asked by Summer on January 17, 2012* -
## chemistry

If 60 grams of KCl can be dissolved in 100 grams water. Would the remaining solution be unsaturated, saturated, or supersaturated?

*asked by Amanda on December 6, 2010* -
## Chemistry

When one of the following substances is dissolved in water, the only positive ions in the solution are hydrogen ions. CH3OH LiOH PO4 -3 CO 3 -2

*asked by Christian on February 25, 2012* -
## algebra

1. the function f(x)=6x/3x-5 is one to one. find its inverse and check your answer. And on the second one can you tell me if I am correct. 2. solve the following exponential solution 7^2x+7^x+1-60=0 7^2 x+7^x-59=0 (49x)+7^x-59=0 49x/49=0/49 x=0/49 x=0

*asked by Heather-two questions please help on December 1, 2012* -
## English Ms Sue

How does social norms change war as a social disease versus non-conformity? What would be a possible solution to solve this problem?

*asked by Michele on February 17, 2009* -
## Alegebra

For a science project, Tyronce is misxing a solution that is 6 parts of sugar to 25 parts of water. How would you wirte this as a decimal

*asked by Michelle on February 17, 2009* -
## chemistry

What is the molality of a solution containing 11.1 g Na2SO4 dissolved in 2269.2 g of water? Just making sure would it be 11.1 divided by 2269.2 times 100?

*asked by Brianna on February 19, 2017* -
## math

Solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.) 5x2 = 9x + 2

*asked by Anonymous on January 22, 2012* -
## Chemisty

By titration it is found that 12.1 mL of 0.130 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

*asked by Tara on April 27, 2016* -
## college general chemistry 2

a chemist titrates 70 ml of .7889M HClO solution with .6221M KOH. calculate pH at equivalence. pKa of HClO is 7.50 I am getting pH of 17.72 Is that right?

*asked by osp on April 3, 2016* -
## ALGEBRA

Beagleboy how do I explain that in 50 words? Post your 50-word response to the following: Explain why the equation -6(x + 3) = -6x + 5 has no solution and 7x +18 + 8x = 8(x + 4) + 7x – 14 has infinitely many solutions.

*asked by SAMANTHA on March 8, 2010* -
## chemistry

Calculate the molality (m) of CH2Cl2 in a solution generated by combining 846 g of the solute CH2Cl2 with 11.2 L of the solvent ethanol.

*asked by eng on January 20, 2010* -
## Chemistry

a 0.451 L solution of 1.71 ascorbic acid (ka1=7.9E-5, ka2=1.6E-12) is titrated with 1.35 M NaOH. What is pH when 0.9540 L of NaOH is added?

*asked by Chris on December 11, 2012* -
## Chemistry

What is the pH change when 27.6 mL of 0.0920 M is added to 94.1 mL of a buffer solution consisting of 0.146 M and 0.174 M ? ( for ammonium ion is .) pH change =

*asked by Anonymous on April 26, 2016* -
## CHEMISTRY - SCIENCE

What is the molality of a solution of 50g of I2 (iodine) dissolved in 130 mL of propane. Propane density .49g/mol.

*asked by chevy on February 25, 2014* -
## Math

5. Find the solution to the system of equations by using either graphing or substitution. y = 6 – x and y = x – 2 (2, 4) (–4, 2) (4, 2) no solutions 6. y = 2x – 1 and y = x + 3 (1 point)(4, 7) (7, 4) (–7, –4) infinite solutions 7. y = 4x and y

*asked by Mr.Brain on May 2, 2013* -
## Physical Science

Determine the concentration of the HCl in a swimming pool?given 100ml of a standard solution of Na2CO3 of concentration 0.05mol.dm

*asked by kimberly on May 26, 2011* -
## chemistry

calculate the freezing point of an aqueous solution of 15.5 grams of glucose dissolved in 150 grams of water

*asked by Sara on March 22, 2014* -
## Chemistry

Given an unknown mixture consisting of two or more substances, explain how we could determine whether that mixture is a true solution, a colloid, or a suspension

*asked by Anonymous on March 11, 2010* -
## Science

When water is mixed with another substance and the mixture will not scatter light, the mixture is a:? 1) suspension 2) compound 3) solution 4) substrate

*asked by Jen on February 25, 2018* -
## Chemistry

in a particular redox reaction, Cr is oxidized to CrO42- and Ag+ is reduced to Ag. Complete and balance the equation for this reaction in acidic solution.

*asked by Anonymous on December 4, 2015* -
## Chemistry

WHAT IS THE BOILING POINT OF THIS SOLUTION? 1.00x10^2g C10,H8,O6,S2 (1,5-naphthalenedisulfonic acid) in 1.00x10^2g H2O (nonionizing solute)

*asked by Jose Reyes on December 7, 2010* -
## chemistry

10.0 mg of a certain protein were dissolved in water to make a solution of 3.50 mL at 28.0o C. If the osmotic pressure is 1.30 torr, what is the molar mass of the protein?

*asked by lizz on October 15, 2010* -
## Math

A nurse has two solutions that contain different concentrations of a certain medication. One is a 20% concentration and the other is a 5% concentration. How many cubic centimeters of each should he mix to obtain 10 cc of a 18.5% solution?

*asked by Cheyenne on September 6, 2017* -
## i really, really, really need help

what coordinate point is the solution to the system? {3x+2y=8 {x-y=1 (2,1) please don't think i just made that up, it's correct. you have to use substitution, when you do solve for x and y, you get: x= y+1 and y=x-1, plug in y for 3x+2y=8 and you get: y=1,

*asked by andrea on February 22, 2007* -
## Chemistry

If you dissolve 13.5 g of malic acid, C4H6O5, in half a liter of water (0.500 L), what is the molarity of the acid in the solution?

*asked by Ashley on May 4, 2014* -
## Chemistry

1. Show quantitatively how you would prepare a solution of 3.10 x 10^2 g of 0.125 molar (m) ethylene alcohol from ethylene glycol and water.

*asked by eddy on August 3, 2011* -
## chemistry

What is the molality of a solution prepared by dissolving 75.2 g of ethylene glycol, HOCH2CH2OH, in 1.34 L of water? Assume the density of water is 1.00 g/ml.

*asked by Silvie on November 17, 2011* -
## Algebra

Solve the system of equations: First:x+3y=5 Second:3x-y=5 multiply the second equation by 3 then add both equations(I know I have it wrong somewhere I just guessed at the solution and it worked. I got (2,1)

*asked by Jon on February 26, 2008* -
## Chemistry

What is the molality of a solution prepared by dissolving 81.5 g of ethylene glycol, HOCH2CH2OH, in 1.36 L of water? Assume the density of water is 1.00 g/ml.

*asked by Silvie on November 17, 2011* -
## chemistry

Would it be feasible to store a solution of copper sulfate in a container made of metallic zinc? Of metallic silver?

*asked by Anonymous on May 14, 2019* -
## Vectors

determine the number of solutions, the generalized parametric solution, and explain why there are no integer solutions for the equation 2x+10y=31

*asked by Sara on March 17, 2015* -
## Chemistry

How many grams of CaCl2 are needed to make 100ml of a 15% solution in water if only the dihydrated (CaCl2⋅2 H2O) salt is available?

*asked by Yue on May 18, 2014* -
## Chemistry

What is the [S^-2] in a saturated solution (.1 M) of H2S, in which the pH had been adjusted to 5.00 by the addition of NaOH? For H2S, Ka1= 1.1X10^-7 and Ka2=1.0X10^-14

*asked by Kate on February 13, 2011* -
## chem class

A 25.00-mL sample of 0.723 M HClO4 is titrated with a 0.273 M KOH solution. The H3O+ concentration after the addition of 10.0 mL of KOH is ???? M.

*asked by richard on November 23, 2010* -
## Chemistry

Hi, wondering if anyone can help with the following problem: A solution of NH3 (kb=1.8x10^-5) has a ph of 11. what is the molar concentration of NAOH? I am unsure how to go about this however i have tried [10^-3][10^-11]/ 1.8x10^-5 with no success. Thanks

*asked by Frank on November 28, 2016* -
## Chemistry

If the solubility constant for Ag2CO3 is equal to 8.1x10^-12 how many grams of Ag2CO3 will dissolve in a .0001 M solution of Na2CO3?

*asked by Jack on April 17, 2014* -
## chemistry

Find the concentration of Ag^+ in a saturated solution of AgBrO_3_ that also contains 0.02M LiNO_3_, .02M KClO_4_ and .01M NaF

*asked by holly on March 9, 2013* -
## calculus

Find the general solution of this de (1+cosx)y'=sinx(sinx+sinxcosx-y) I need full step have tried but nothing good is coming out

*asked by matt on April 25, 2019* -
## Algebra

a car rents for $40 per day plus 21cent per mile. You are on a daily budget of $82. What mileage will allow you to stay within your budget? The solution is

*asked by Lady t on July 30, 2010* -
## chemistry

A bottle containing a standard solution of KMnO4 is found to have brown stains on the inside. Why will this KMnO4 be of no further use for quantitative experiments?

*asked by red on May 2, 2010* -
## math

40% of k liters of acid are added to 60% of w liters of water. Write an algebraic expression for the total volume of the solution.

*asked by Anonymous on January 9, 2017* -
## Chemistry

What is the Cl concentration just as Ag2CrO4 begins to precipitate when 1.0 M AgNO3 is slowly added to a solution containing 0.015 M Cl and 0.015 M CrO4^2?

*asked by Jake on February 20, 2011* -
## analytical chemistry

compund x is known to absorb at 510nm. If you dilute a solution containing x by 1/4, by how much does the absorbance increase or decrease. if it stays the same just state it stays the same.why

*asked by ami on March 26, 2013* -
## Chemistry

Calculate the mass (in grams) of sugar, C12H22O11, in 142.4 mL of a 1.39 M solution of sugar. (atomic weights: C = 12.01, H = 1.008, O = 16.00)

*asked by Nora on November 7, 2014* -
## Chemistry

In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species. (most to least) H2O HClO H3O OH- OCl-

*asked by Paula on March 9, 2013* -
## Math

Got quite a silly question, but wondering if anyone knows the solution. Find the sum of the two missing numbers in the sequence 4, 3, 3, 2, 3, 3, 7, 7, 2, _,_ a)10 b)8 c)11 d)7 e)6 Cant seem to find the pattern here, can anyone see it?

*asked by Alex on November 27, 2018* -
## chemistry

Acetic acid (CH3CO2H) is a weak acid. As a result, a solution of sodium acetate (NaCH3CO2) will be _____.

*asked by ana on January 6, 2014* -
## Chemistry

What mass of water must be used to dissolve 20.0 grams of ethanol, C2H5OH, to prepare a 0.0500 molal solution of ethanol?

*asked by Marcus on February 10, 2013* -
## Chemistry

Find the pH of 1.0M Na2SO3(aq) solution at 25 degrees Celsius. I am not sure how to start this problem. I started off by doing 1.0M = x/1000 to get x=0.001 but I do not know if this is how to start.

*asked by Hannah on April 3, 2012* -
## Chemistry

What is the PH of an aqueous solution consisting of 0.070 M formic acid (HCOOH) and 0.070 M sodium formate (HCOONa)?

*asked by Leroy on November 19, 2014* -
## Chemistry

Calculate the mass of sodium sulfate decahydrate need to make a 500ml solution that is .025m in sulfate anion?

*asked by Pam on October 26, 2011* -
## chemistry

determine the concentration of NH3(aq) that is required to dissolve 775 mg of AgCl(s) in 100.0 mL of solution. The Ksp of AgCl is 1.77× 10–10.] please help!!!!!!!

*asked by maggie on April 3, 2015* -
## Chemistry AP

How many mL of0.4M AgNO3 solution must be added to 200mL of0.4 M NaI in order to for 11.7 grams of AgI precipitate?

*asked by Angel on December 27, 2016* -
## osu

a 50.0 ml sample of a 15% (m/v) solution of H2SO4 is added to water to give a final volume of 250.0 ml. What would the final concentration be?

*asked by Kat on November 23, 2010* -
## Chemistry

why does the value of i (van t' hoff factor) change with regards to theoretical vs. experimental? i'm not quite sure what happens but i know it has to do with ions in the solution. could it be attractive forces between ions?

*asked by Jonathan on February 14, 2008* -
## chemistry

If the concentration of Pb^2+ is known to be roughly 2.1 x 10 to the power of -9 mol/L within a saturated solution of Pb(PO4)2, calculate the Ksp of Pb3(PO4)2?

*asked by Angelo on April 9, 2008* -
## Chemistry

In a 1.0× 10–4 M solution of HClO(aq), identify the relative molar amounts of these species from most to least: HClO, OCl, OH^-, H30^+, H20

*asked by Ethan on February 21, 2013* -
## Chemistry

6.00 g of hemoglobin was dissolved in 250.0 mL of solution. The resulting osmotic pressure was 6.80 mmHg at 23.0C. what is the molar mass of hemoglobin?

*asked by libby on June 10, 2018* -
## chemistry

Explain how you would prepare the following dilute solutions from the more concentrated ones: a. 200ml of .500M HCL from a 6.00M HCL solution.

*asked by cameron on April 4, 2011* -
## Chemistry

100 mL of LiNO3, 0.241 M is mixed with 240 mL of 0.618 M Ca(NO3)2. What is the final concentration of NO3- in the solution?

*asked by Matt6 on November 25, 2014* -
## chemistry

By titration it is found that 20.5 mL of 0.168 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution

*asked by Morgan on April 27, 2014* -
## algebra

Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard form, ax^2+bx+c=0. Solution:2

*asked by Terry on April 8, 2012* -
## chemistry

A solution is prepared by dissolving 17.1grams of sucrose, c12h22o11, in 275grams of h20. a)what is the molar mass of sucrose? How would i do that??

*asked by Miley on April 5, 2008* -
## chemistry

By titration it is found that 66.1 mL of 0.125 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.

*asked by trae on April 23, 2012* -
## chemistry

What products are formed when sucrose is heated in an aqueous sulfuric acid solution? What role does the acid play?

*asked by drew on January 16, 2011* -
## Chemistry

Calculate how many grams of FeSO4.7 H2O (MW = 278.02 g/mol) will be needed to prepare 1 mL of a 0.2 M FeSO4 solution? Is that .0304g?

*asked by Feufolia on February 25, 2016* -
## chemistry

What is the concentration of silver(I) ion in a saturated solution of silver(I) carbonate containing 0.0092 M Na2CO3? For Ag2CO3, Ksp = 8.6 × 10–12.

*asked by Anonymous on May 3, 2010* -
## chemistry

What are the freezing point and boiling point of an aqueous solution of 15.5 g glucose(C6H12O6) dissolved in 150 g of water?

*asked by Daniel on April 7, 2013* -
## Math

1. Determine which ordered pair is a solution of y = x^2-2 (5, 21), (–5, 24), (–1, –1), •• (–2, 6) 2. Without graphing, tell whether the line containing (6, –3) and (0, –8) is horizontal, vertical, or neither I think it's horizontal Correct

*asked by Queen on April 10, 2016* -
## Environmental

I have to write a paper on an environmental problem and expand on a (or two) solution to the problem... any ideas? Anything specific would be great since I'm at a stand still...

*asked by Jessy-Leigh on December 3, 2007* -
## Chemistry

A solution has a hydroxide-ion concentration of 7.48X10-5 M. What is it's hydronium-ion centration? I have no idea where to begin on this question...

*asked by Robby on February 18, 2013* -
## chemistry

Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.

*asked by Jessica on February 19, 2011*

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