# 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 263
1. ## Chemistry

List the following compounds in order of increasing electrical conductivity: 0.1 M formic acid (HCOOH), 0.1 M (NH4)3PO4, 0.1 KCl, and 0.1 M glucose solution (C6H12O6). Why are they in that order?

asked by Sam on November 6, 2013

The boiling point elevation of a solution consisting of 2.12 g of a nonvolatile solute in 97.4 g of benzene is 0.6602 oC. What is the molecular weight of the unknown solute? i have no idea how to solve this question

asked by jerry on February 13, 2009
3. ## Chemistry

The freezing point of a 0.10m solution of mercury(I) nitrate is approximately -0.27 degrees celsius. Show that these data suggest that the formula of the mercury(I) ion is Hg2 2+

asked by Amy on March 6, 2011
4. ## child development

If a child is unable to connect to others because her parents do not show her love and acceptance what would be the appropriate solution for this situation? A. Change adult expectations. B. Help the child get her needs met. C. Get outside help. D. Use

asked by bev on August 25, 2015
5. ## chemistry

Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

asked by sarah on November 4, 2012
6. ## chemistry

Given the reaction: H2SO4 = 2NaOH -> NaSO4 = 2H20. Determine the # of moles of sulfuric acid id needed to completely react with 2.3 L of 0.5 M of NaOH. Then determine the concentration of the solution if 3.0 L of it are used instead.

asked by sarah on November 4, 2012
7. ## Calculus

let d2y/dx2= 6x. Find a solution to the differential equation that is continuous for negative infinity to positive infinity and whose graph passes through the point (0,1) and has a horizontal tangent there.

asked by Anastasia on February 26, 2011
8. ## chemistry

A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

asked by ram on February 24, 2017
9. ## Chemistry

Find the pH and pOH of a solution that is 1.04x10^-4 M HCl. Do i have to use an ice table to solve this? or is there a short cut? please help No. HCl is a strong acid (100% ionized), so the H^+ concentration is 1.04 x 10^-4 M.

asked by T on July 4, 2007
10. ## Chemistry

When a pair of copper wires are connected to the (+) and (–) terminals of a 9–V battery and immersed in a solution containing I- ions, one of the wires becomes coated with I2. Besides simply wiping off the wire, how else could you remove the I2

asked by Anonymous on October 23, 2013
11. ## Chemistry

A 30.00ml sample of 0.1234 M hypobromous acid (HBrO) is titrated with a 0.2555 M KOH solution. The Ka for HBrO is 2.5*10^-9 Calculate the pH of the titration mixture at the equivalence point.

asked by Anonymous on April 17, 2010
12. ## Math

Hi. So we had a long test with this question.. I was wondering how to solve it? Coz our teacher didn't discuss the answers.. and most probably we'll have the same type of question during midterms.. Find the Solution Set 9/|2-5x| - 4/y^2-3y = 5 2/|2-5x| +

asked by Jen on August 17, 2011
13. ## Math clarification Reiny

This is the problem you helped me with. I was curious, do I write the solution set as (1 + i3ã3)/2, (1-i3ã3)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } ã(1 - 4(1)(7))/2 = (1 } ã-27)/2 Your answer is an

asked by Sabrina on September 25, 2010
14. ## Chemistry

A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.

asked by BEE on August 1, 2011
15. ## Chemistry

A student actually used 0.847g sample of impure KHP and the endpoint was reached after 19.82 ml of sodium hydroxide solution was added, What is the percent KHP in the unknown to four significant figures.

asked by BEE on July 31, 2011
16. ## Chemistry

A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant of Co(NH3)62 is 5.0× 10^31.

17. ## Chemistry

A 1.516 M solution is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.

asked by Anonymous on November 4, 2014
18. ## Chemistry

What is the concentration of chloride ions (in) in a solution prepared by adding 0.075 moles of calcium chloride to 425 mL water,assuming no volume change up on mixing? Thanks!

asked by Wendy on April 23, 2012
19. ## physics

a tennis ball is served horizontally from 2.4 above the ground at 30 m/s the net is 12 m away and 0.9m high will be clear the net? a. 0.64m b. 1.62m c.2.72m d.none ans is option B .... but how? wanna solution..

asked by MCAT student on May 7, 2018
20. ## Chemistry

What's is the concentration of silver ions in a saturated solution of silver carbonate? The k^sp of Ag2CO3 is 8.1x10^ -12. Is the answer 5.88x10^-8? I have a test tomorrow and I really need to make sure I'm doing these problems right, but I feel like I am

asked by Catherine on May 9, 2013
21. ## biology

Most automobiles have water-cooled engines. What must be true about a solution that can replace water in the cooling system, such as antifreeze? I know this is the second time I'm posting this question, but it's been hours and still no one's responding.

asked by lamiya on September 12, 2009
22. ## AP Chemistry

When 0.055 moles of lead(II) nitrate are dissolved in enough water to make 803 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

asked by Lacey on September 19, 2012
23. ## math

A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

asked by Anonymous on July 29, 2017
24. ## Chemistry

Does anyone know how to do this problem, i can't seem to solve it. If 39.25 g of a substance is dissolved in 155.5 g of benzene solvent, the freezing point of the solution is 0.08 oC. Calculate the apparent molar mass (g/mol) of substance.

asked by SuSu on February 2, 2010
25. ## pre calc

Find the values of b such that the system has one solution. x^2 + y^2 = 36 y= x+b and then they give me an answer box b=_________ (smaller value) b=_________ (larger value) i have absolutely no idea how to even begin this and what they are asking. could

asked by gabs on June 7, 2011
26. ## chemistry

What is the molar concentration of 2000. mL of aqueous solution containing 125 g of glucose, C6 H12O6? Molar mass 180.15 g/mol. Report your answer to three significant figures.

asked by Mely on September 5, 2010
27. ## science-chem

If I'm given 0.025 molar solution of Li2SO4(aq) and I have to find the concentration of each ion, how would I go about doing it? THANKS! My work (just li): 0.025M Li2SO4*(2MolLi/1MolLi2SO4)=.....Would that be right? I feel like there has to be one more

asked by Ally on September 17, 2009
28. ## pre cal

Use synthetic division to show that x is a solution of the third-degree polynomial equation, and use the result to factor the polynomial completely. List all the real zeros of the function. x^3 - 28x - 48 = 0 Value of x = -4 Please help!!Thank you

asked by megan on September 17, 2010
29. ## Chemistry

A solution is prepared by adding 300 mL of 0.500 M NH3 and 100 mL of 0.500 M HCl. Assuming that the volumes are additive, what is the pH of the resulting mixture? Kb for ammonia is 1.8 x10 -5

asked by Taylor on October 4, 2010
30. ## Chemistry

For the following acids: i. CH3COOH ii. HNO2 iii. HCN a) What is the dissociation equation in an aqueous solution? b)Give the KA expression for each of the acids. c)Identify the acid-base pairs.

asked by Andrea on May 13, 2012
31. ## chem

7.50gram quantity of a diprotic acid was dissolved in water and made up to exactly 250ml. If 25ml of this solution were neutralized by 11.1 mL of 1.0 M KOH then what is the molar mass of the acid? I did 7.50/5.55x10^-3

asked by Jin on July 24, 2010
32. ## Chemistry

What is the concentration of arsenate ions in 3.5 M solution of arsenic acid? The acid-dissociation constants of H3AsO4 are: Ka1 = 5.0 x 10-3 Ka2 = 9.3 x 10-8 Ka3 = 3.0 x 10-12 I can't figure out how to set up the question

asked by Kelly on March 18, 2015
33. ## Solid Mensuration

In a circle with a diameter of 10m, a regular five-pointed star touching its circumference is inscribed. What is the area of the part not covered by the star? Pls help with a solution and a diagram. Thanks!

asked by Justine on April 18, 2016
34. ## math

A fruit seller buys 100 bananas for Rs 40. Twenty bananas are spoiled and thrown away. At what rate should he sell the remaining so as to gain 10% ? Pls give me the solution of it.

asked by sam on November 18, 2015
35. ## chemistry

a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.

asked by alice on May 13, 2013
36. ## Physics

If the average gauge pressure in the artery is 1.41E+4 Pa, what must be the minimum height, h of the bag in order to infuse glucose into the artery? Assume that the specific gravity of the solution is 1.04.

asked by Sam on April 20, 2016
37. ## Pre-algebra

Dwayne walks a total of 960 feet around 3 sides of a square city block. Which equation and solution show a correct way to find the perimeter, P, of the block?

asked by Leigha on October 24, 2014
38. ## Chemistry

A 0.130-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co2 ions at equilibrium? Assume the formation constant of Co(NH3)62 is 5.0× 10^31.

39. ## Chemistry

When 0.016 moles of lead(II) nitrate are dissolved in enough water to make 748 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

asked by Mike on October 11, 2010
40. ## Math

Hi! My teacher wanted me to sketch the graph of solution set of each system. For the first question, she wants me to use the slope intercept form and the second question using a table of values, but, I'm a little lost. Can someone help? Thanks! 1.) 3x + 2y

asked by Heather on March 21, 2015
41. ## chemistry

What is the molar concentration of 2000. mL of aqueous solution containing 125 g of glucose, C6 H12O6? Molar mass 180.15 g/mol. Report your answer to three significant figures.

asked by Mely on September 5, 2010
42. ## Chemistry

Like water, liquid ammonia undergoes autoionization: (a) Identify the Brønsted acids and Brønsted bases in this reaction. (b) What species correspond to H and OH and what is the condition for a neutral solution?

asked by sok on March 10, 2011
43. ## Math, Calculus

help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx - 2x^(2) dy = 0 ;y = e, x

asked by Huck on October 19, 2009
44. ## chemistry

Calculate the molarity (M) of Na+ in a solution prepared by adding 1.00 L of 0.800 M NaHC2O4 and 250 mL of 0.300 M NaHC2O4 . Assume volumes are additive. the answer is 0.700 but im not sure how to go about solving it please help thanks

asked by BOB on September 29, 2011
45. ## chemistry

There is a ball with a mass of 1000 lbs. It's turned into wire with a diameter of 3.12 x 10^-1 How long is the wire? This is my crazy chemistry teacher's idea of a test...and I don't even think there's a solution. HELP ME

asked by Molly on October 3, 2011
46. ## chemistry

a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.

asked by lucy on May 13, 2013
47. ## wildcat

Compound Interest: Suppose \$1,600 is invested in a savings account that pays 5% compounded semiannually, how much is in the account at the end of 11 2 years? having difficulties in finding a solution

asked by Lynn on September 17, 2012
48. ## Chemistry

When 0.083 moles of lead(II) nitrate are dissolved in enough water to make 617 mililiters of solution, what is the molar concentration of nitrate ions? Answer in units of

asked by Rara on October 2, 2011
49. ## Chemistry

A 75.0g sample of liquid contains 17.5% by mass of H3PO4 (molar mass = 98.0g/mol). If 215.0mL of Ba(OH)2 is needed to completely neutralize the acid, determine the concentration of the Ba(OH)2 solution used

asked by Biplob on October 20, 2016
50. ## Chemistry

What volume of 0.01 mol L-1 Li2CO3 solution would contain 0.035 mol lithium carbonate? Give your answer as 2 sig fig (this is technically not correct), followed by a space then the units.

51. ## Science // Chemistry

How many grams of KOH are needed to make 1.00L of a 1.3 molar (1.3 M) solution? ------------------ I am not sure how to start this question, my teacher wants us to use conversion factors and write it out but I don't get how I am supposed to start it.

asked by Anonymous on March 2, 2015
52. ## chemistry

If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?

53. ## Chemistry

Calculate the molarity of 25.00ml H2SO4 solution if 32.48ml of 0.1068M NaOH is required to titrate? Balanced equation is H2SO4(aq)+2NaOH(aq)=Na2SO4(aq)+2 H2O (l)

asked by Jake on October 22, 2014
54. ## Math Reiny question

This is the problem you helped me with. I was curious, do I write the solution set as (1 + i3ã3)/2, (1-i3ã3)/2 change it to the standard form first x^2 - x + 7 = 0 a=1, b=-1, c = 7 x = (1 } ã(1 - 4(1)(7))/2 = (1 } ã-27)/2 Your answer is an

asked by Sabrina on September 24, 2010
55. ## Chemistry

When 0.046 moles of lead(II) nitrate are dissolved in enough water to make 485 milliliters of solution, what is the molar concentration of nitrate ions? Answer in units of M.

asked by Cheyenne on September 23, 2010
56. ## intermediate algebra

in solving the equation (x+4)(x-4)=9 eric stated the solution would be x+4=9 =>5 or x-4=9 =>13 however at least one of these solutions fails to work when subsituted back into the original equation. why is that? solve the problem yourself and explain your

asked by Anonymous on August 22, 2012
57. ## Math

Hi! My teacher wanted me to sketch the graph of solution set of each system. For the first question, she wants me to use the slope intercept form and the second question using a table of values, but, I'm a little lost. Can someone help? Thanks! 1.) 3x + 2y

asked by Heather on March 21, 2015
58. ## Chemistry

Calculate the molar solubility of MgCO3 in a solution that already contains 1.7×10−3 M sodium carbonate. MgCO3 Ksp = 6.82 x 10-6 IMPORTANT NOTE: You must use the quadratic equation to solve this problem. (DrBob222- thank you so much for all your help!)

asked by Chloe on April 26, 2013
59. ## chemistry

determination of the oxalate content in k2 cu(c2o4)2 .2h2o, during standardization of permanganate solution using sodium oxalate, can the titration between Mno4- and C2o42- at 25degree celcius be perform?

asked by ABCx on June 26, 2012
60. ## CHEMISTRY!!!!

Determine the pH at the equivalence point in the titration of 41.0 mL 0.096 M formic acid with 0.108 M NaOH at 25oC. Calculate the pH of a solution that is 0.22 M pyridinium ion (C5H5NH+) at 25oC.

asked by Michelle on March 5, 2015
61. ## Chemistry

How do I do this?? Calculate the pH at the equivalence point for the titration of 0.20 M aniline (C6H5NH2, Kb = 3.8 x 10-10) with 0.20 M HCl. [Hint: remember the dilution factor caused by addition of titrant to the aniline solution.]

asked by Jamie on October 15, 2009
62. ## Science

15gm of substance is dissolved in 450ml of water the resulting solution was found to freeze at -0.34degree Celsius.Calculate the molar mass of the substance. Please help me out with this problem..

asked by Gash on March 22, 2019
63. ## English Expressions

Think of the loci method. In this room you can find 9 fixed things and number the things systematically from top to bottom and from left to right. Then you can recall what you have memorized with ease. You need to use the 3 3 3 system. After that prepare 9

asked by John on December 12, 2007
64. ## Science Sorry I just need help one more time!

Ok I am doing a project in science on radiation. I have to make a brochure. I need help answering these questions about radiation. Or some good sites would be nice too. I looked on google but they didn't really help. Thank you! Where does radiation come

asked by Amy on January 15, 2009
65. ## Physics

A target lies flat on the ground 3m from the side of a building which is 10m tall. A student rolls a ball off the horicontal roof of the building in the direction of the target. Air resistance is negligible. Te horizonal speed with which the ball must

asked by Tammy on March 25, 2007
66. ## Finance

Rob and laura wish to buy a new home. The price is \$187,500 and they plan to put down 20%. CIBC will lend them at a fixed rate for 25 years with monthly payments. How much will Bob and Laura's monthly payment be? Assuming they pay off this mortgage over

asked by Yvonne on September 30, 2015
67. ## physics

If a 80 lightbulb emits 4.0 of the input energy as visible light (average wavelength 550 ) uniformly in all directions, estimate how many photons per second of visible light will strike the pupil (4.0 diameter) of the eye of an observer 3.0 away. 1. I

asked by sarah on April 16, 2012
68. ## Algebra/Math

How much dry substance is there if we have 150g of 8% of a solution of this substance.

asked by GeniusTigeress on February 20, 2017
69. ## maths steve reiny

Sqrt(x)^sqrt(x)=2 show solution step that all i need thanks

asked by Anonymous on November 2, 2016
70. ## chemistry

Calculate the [CH3CO2H] in a solution if it has a pH 3.21. CH3CO2H = CH3CO2- + H+

71. ## math

if the domain is the set of integers, the solution set of x^2 -3x -4

asked by Anonymous on December 26, 2010
72. ## math

1.0 Solve for x: (a) 2x ¨C 3(x + 2) ¡Ý 5x ¨C( x- 5) (b) Solve simultaneously x - 5¡Ü 2 and x ¨C 1 ¡Ý 3 2.0 Find solution to: (a) 5/(x-1) > 0 (b) (3x+3)/(3x-x2 ) < 0

asked by lupupa on November 11, 2011
73. ## Chemistry

If the Ka of a monoprotic weak acid is 4.3*10^-6, what is the pH of a 0.16 M solution of this acid?

asked by Josh on July 24, 2011
74. ## Chemistry

If Ka for HNO2,=4.5x10-4, find the [H+] a 0.9 M HNO2 solution.

asked by Kathy on May 26, 2016
75. ## chemistry

A liter of 8 M NaOH solution contains how many grams of NaOH?

asked by a on January 14, 2010
76. ## chemistry.

How many grams of H3PO4 are in 175 Ml of a 3.5 M solution of H3PO4?

asked by Denmark on November 15, 2009
77. ## chemistry

How would you prepare a standard solution of 1m HCL(5.6 of HCL is 1.18)?

asked by Joy on March 8, 2011
78. ## pre calculus honors

solve the system if possible | x+y+z = 15 | | < 7x+y+z = 75 | | | 3x+y-z=29 a. x=10,y=2,z=3 b. x=–10,y=–2,z=–3 c. x=3,y=10,z=–3 d. x=12,y=9,z=–3 e. no solution; inconsistent system

asked by evelyn on August 24, 2016
79. ## Chemistry

When you have 250. mL of a 2.80 M solution of HCl, how many moles of HCl do you have

asked by Kay on February 11, 2013
80. ## chemistry

how many g of agno3 would you need to make a 575ml solution of 0.25 m agno3

asked by sherry on August 8, 2012
81. ## math

how i can see the exact solution of 6y-12y=12 and4x-12y=8

asked by luis on November 11, 2012
82. ## chemistry

What mass of KBr is contained in 50.0 mL of a 5.10 M solution of KBr?

asked by taylor on January 23, 2015
83. ## algebra

Write an inequality and provide a value that may or may not be a solution to the inequality.

asked by mary on January 15, 2009
84. ## Chemistry

how many ml of 0.200m NAOH solution contain 2.00g NaOH(MW =40.00

asked by Tapiwa on May 4, 2016
85. ## Differential Equations

Verify whether the given equation(y=c1-cos(x+c2)) is a solution to this equation[(d^2y/dx^2)^2 + (dy/dx)^2 - 1 = 0].

asked by Alex on April 16, 2017
86. ## math116

how do you know when an equation has infinitely many solutions? How do you know when an equation has no solution?

asked by barb on August 5, 2010
87. ## algebra

Can you give me and example of an inequality and provide a value that may or may not be a solution to the inequality?

asked by C on April 5, 2008
88. ## science(chemistry)

2 mL 1.5 M naoh and 1.5 mL 2 M naoh mixed solution's concentrate=?

asked by rajib on May 19, 2016
89. ## math

tell whether each equation has one solution, zero solutions or infinite solutions 5(x-3)+6=5x-9

asked by bill on March 8, 2017
90. ## Chemistry

What is the [H3O] concentration in a 1.0M CH3COONa solution? (The Ka for CH3COONa is 2.0*10-5.)

asked by Brianna on February 24, 2012
91. ## math

You have a 70% dextrose solution. How many grams of dextrose are in 400ml?

asked by melissa on March 9, 2008
92. ## Chem 121

How many grams of NaOH are present in 9.0 mL of a 8.0% (m/v) NaOH solution

asked by Barbara on July 26, 2011
93. ## CHEMISTRY

1. The use of a more dilute NaOH solution for the standardization of NaOH.

asked by MM on January 16, 2012
94. ## Math

Write an inequality and provide a value that may or may not be a solution to the inequality.

asked by jay jay on September 3, 2008
95. ## algebra 2

how do i work this 3x2-2x-8=0 the solution is -6 and 4 how do you work this out for my class

asked by kay on January 18, 2012
96. ## algebra

Can you give me and example of an inequality and provide a value that may or may not be a solution to the inequality?

asked by C on April 5, 2008
97. ## Biology

You need 25ml of 2% milk solution (v/v. How much milk and water will you need?

asked by Anonymous on January 19, 2015
98. ## Algebra

WRITE AN INEQUALITY AND PROVIDE A VALUE THAT MAY OR MAY NOT BE A SOLUTION TO THE INEQUALITY

asked by olabisi on August 5, 2008
99. ## Trig

The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that is(are) in the interval (0,π/2) is one of following a. {π/6} b. {π/3} c. {π/4} d. {π/3, π/6} e. {π/6, π/4}

asked by Lenny on December 13, 2011
100. ## Chemistry

What is the mass of a 8.64% (m/m) AlCl3 solution containing 7.59g AlCl3?

asked by Elaine on February 7, 2013