# 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 217

How can I improve my thesis for a comparative essay: Although both ¡°All is Calm¡± and ¡°The Bicycle¡± portray love and problems between family members, the protagonists in the stories experience drastically different journeys and each learned

asked by Stella on November 5, 2011
2. ## Annuities

Can someone tell me if this is ordinary annuity of future or ordinary values sinking funds present value or what is it. The question is You are earning an average of 46500 and will retire in 10 years. If you put 20% of your gross average income in an

asked by Scott Ingraham on April 12, 2008
3. ## IT 221

I need help with this one because I don't even know where to start. I need to use microsoft project to develop a work breakdown structure (WBS) for my project. ok I tried going into Microsoft project put I just don't know how to organize it, and i can't

asked by Sam on November 29, 2008
4. ## Physics

Could someone help me on how to put this all together. Atomic physicists ignore the effect of gravity within an atom. To see why, calculate and compare the gravitational and electrical forces between an electron and a proton separated by 10-10m. Im

asked by Olivia on October 18, 2007
5. ## chemistry...weird question

on heatin, 0.02mol of the element M reacts with 0.025mol of oxygen gas. What is the empirical formula of the oxide of M? The mole ratio is .025/.02=1.25 or 5/4 So the O2 has a ratio of 5 to one Metal. M4 (O2)5= M>sub>4O10 or writing it in lowest whole

asked by Cynthia on May 29, 2007
6. ## Chemistry

Consider the reaction Zn(OH)2(s) + 2CN-(aq) Zn(CN)2(s) + 2OH-(aq) a) Calculate K for the reaction. (Ksp Zn(CN)2= 8.0 x 10^-12) b) Will Zn(CN)2 precipitate if NaCN is added to a saturated Zn(OH)2 solution? I tried splitting this into two equations:

asked by Kristina on April 11, 2007
7. ## English

1)Every person that uses a plastic bag (better everyone who uses a plastic bag, has to pay ten pence; is "every time you use a plastic bag, you have to pay...??? correct) 2) one of his servants (also one among his servants?) 3) he said that when the guilty

asked by Franco on January 7, 2010
8. ## chemistry

The percent composition of iron in a sample of steel can be determined by dissolving a sample of steel in concentrated acid. The resulting solution is then titrated with a permanganate solution. When all of the iron has reacted with the permanganate, the

asked by manny on August 19, 2007
9. ## Science I Need Help

Which of the following distinguishes living things from nonliving things? A)Living things are made up of cells; nonliving things are not. B)Living things are made up of atoms; nonliving things are not. C)Living things are made up of elements; nonliving

asked by Nathan on October 11, 2017
10. ## Science really need help

Which of the following distinguishes living things from nonliving things? Living things are made up of cells; nonliving things are not*** Living things are made up atoms; nonliving things are not Living things are made up elements; nonliving things are not

asked by Abigail on September 19, 2017
11. ## Science

Which of the following distinguishes living things from nonliving things? A) Living things are made up of cells;nonliving things are not B) Living things are made up of atoms;nonliving things are not. C) Living things are made up of elements;nonliving

asked by Jessica on October 20, 2017
12. ## economics

Review: Full, Anonymous: No Week 3 Homework Please answer the following questions: 1. The following information describes the value Lori Landlord places on having her five apartment houses repainted. She values the repainting of each apartment house at a

asked by austin on August 16, 2010
13. ## chemistry

a sample of Na2SO3.H2O weighing 0.62g is addedto 100ml.1NH2SO4 .THE resulting solution will be?

asked by cdscs on August 17, 2012
14. ## chem

suppose that 1.550g of hydrochloric is dissolved into 500.0ml of solution. what is the molar concentration of the acid?

asked by frankie on March 18, 2013
15. ## Chemistry

Pb(NO3)2(aq) + NaSO4(aq) → PbSO4(s)+ 2NaNO3(aq) Identify the ions that are present in each solution, and calculate their concentrations.

asked by Sam on May 16, 2012
16. ## Science (Chem)

Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

asked by Kevin on May 5, 2018
17. ## math

identify the choice that best completes the statement or answers the question. For questions 1-3, what is the solution of the systems? Use subsitution. 1. y = x + 6 y = 2x

asked by liv on May 7, 2018

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
19. ## Math

period of a 100 MHz FM radio were is roughly 1 X 10 to the negative 8th s. formulate a problem and solution.

asked by Ivan on January 3, 2016
20. ## Chemistry

A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the besst procedure for preparing this solution ?

asked by Cynthia on February 22, 2012
21. ## Analytical chemistry

How many grams of solid CuSO4. 5H2O are needed to prepare a 500 ml of a 1000 ppm solution of Cu?

asked by Lori on February 2, 2014
22. ## Chemistry

How many milliliters of a 2.5 hydrochloric acid solution would be needed to react completely with 32.0 grams of magnesium metal

asked by Kyle on June 16, 2011
23. ## Chemistry

Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

asked by Margaret on February 27, 2013

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
25. ## Chemistry

A solution is prepared by adding 50ml of 0.050M HCl to 150 ml of 0.10M HNO3. Calculate pH

asked by sydney on May 6, 2019
26. ## Chemistry

Outline how a 250cm^3 of 0.10mol/dm^3 hydrochloric acid could be prepared from 100cm^3 of a 2.0mol/dm^3 stock solution

asked by Gideon on September 21, 2017
27. ## chemistry

Find the quantity of heat produced when 100ml of 0.1N HCL is completely neutralised with NAOH solution

asked by chinmay on March 27, 2016
28. ## ap chemistry

Calcu- late the mass of pure acetic acid in 440 mL of this solution at 20 C. Answer in units of g.

asked by brian on October 1, 2010
29. ## chemistry

What percentage of the Ba2+ in solution is precipitated as BaCO3(s) if equal volumes of 2.4*10^-3 M Na2CO3(s) and 1.1*10^-3M BaCl2(aq) are mixed

asked by alice on November 21, 2012
30. ## Chemistry

If a piece of copper metal is dipped into a solution containing Cr3+ ions, what will happen? Explain with Ev values

asked by Jake on May 15, 2012
31. ## Chemistry Molarity

What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

asked by Toni Jones on March 28, 2011
32. ## chemistry

Calculate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8%

asked by Laura on April 5, 2008
33. ## engineering mathematics

use modified newton's raphson method to indicate the solution correct to 6 decimal places near to x=2 of the equation x^3-6x^2+13x-9=0

asked by ayooluwa on April 15, 2016
34. ## chemistry

What stoichiometric concentration of the indicated substance is required to obtain an aqueous solution with the pH} value shown below? aniline (C6H5NH2) for PH of 8.90

asked by anonymous on April 11, 2010
35. ## chemistry

What percentage of the Ba2+ in solution is precipitated as BaCO3(s) if equal volumes of 2.4*10^-3 M Na2CO3(s) and 1.1*10^-3M BaCl2(aq) are mixed

asked by Allyx3 on November 22, 2012
36. ## math

Solve using the substitution method. If the system has no solution or an infinite number of solutions, state this. -2x + 0y = -14 x + 11y = 18

asked by Jim on June 16, 2011

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
38. ## math

solve the following system of equations enter the x coordinate of the solution. Round your answer to the nearest tenth. 5x+2y=22 -2x+6y=3

asked by bob on February 11, 2016
39. ## Chemistry

What would the pH of the solution be if the salt NaHX is dissolved in water? What anion predominates at the first equivalence point of the titration of X^2- with H^+?

asked by sea lively on July 30, 2018
40. ## Chemistry 12

Calculate the volume of 12 M Na2SO3 which needs to be added to 500.0 mL of water in order to produce a solution in which [Na+]= 0.200 M.

asked by Riann on October 8, 2013
41. ## Chemistry

Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

asked by Kevin on May 5, 2018
42. ## calculus

Find the domain for the particular solution to the differential equation dy dx equals the quotient of 3 times y and x, with initial condition y(1) = 1.

asked by Bree on May 20, 2016
43. ## chemistry

What volume of solution should be dispensed from the buret to provide 3.718 mmol CO3 2-? answer in units of mL.

asked by chemistrry help! on May 2, 2010
44. ## Chemistry

A 1.00 L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C. thanks

asked by Rebekah on April 27, 2011
45. ## Chemistry

66.9 g of a substance X dissolves in enough water to make 0.428 L of a 0.68 M solution. Calculate the molar mass of X in g/mol.

asked by Devin on April 29, 2015
46. ## Algebra

Find the solution set of 2√x = x - 3. A. {1, 9} B. {9} C. {1, -9} I got a quadratic and factored it as (x - 9)(x - 1). Then the solutions are x = 9 and x = 1. But the answer is supposed to be just 9. However, wouldn't x = 1 also work, if we do √1 = -1?

asked by Anonymous on April 1, 2017
47. ## Chemistry Molarity

What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

asked by Toni Jones on March 28, 2011
48. ## chemistry

Calculate the freezing point of 1molar aqueous solution (density =1.04g) of kcl (kf for water =1.86)K=39,cl=35.5

asked by shubham on April 29, 2015
49. ## chemistry II

Calculate the grams in solute: 300 g of water in the preparation of 15.0% NaNO solution. Atomic Weight: Na=23,N=14,o=16.

asked by criss on December 17, 2012
50. ## chem

What is the pH of 1.00 L of the buffer solution that contains 0.100 M HF and 0.120 M NaF after 0.020 mol of HNO3 is added? The Ka of HF is 3.5×10−4, and so pKa = 3.46.

asked by Rebecca on November 11, 2013
51. ## Chem

What is the hydroxide ion concentration of a solution prepared by dissolving 0.488 g of Mg(OH)2 in 236 mL of water? How do I solve this???

asked by Carrie on July 25, 2012
52. ## chemistry

What is the concentration, in units of molarity, of a 350 mL solution containing 0.298 moles of sodium chloride in water?

asked by Bekah on September 27, 2011
53. ## Chemistry

Some is released if the temperature is increased. Some O2 is always entering and leaving solution at the same time. You end up with an equilibrium between the two processes.

asked by drwls on June 21, 2005
54. ## Chemistry

How do I calculate the amounts of Na2SO4 and CaCl2 that I need to create a solution of CaSO4 at 9 grams/Liter concentration?

asked by Kato on September 1, 2016
55. ## Chemistry

H2S+H2O H3O +HS why THIS BUFFER SOLUTION IS ABLE TO RESIST CHANGE IN PH WHEN SMALL AMOUNTS OF OH ARE ADDED TO IT.

asked by Clare on April 29, 2015
56. ## Chemistry

Which of the following will be more soluble in an acidic solution than in pure water? Ag2SO4 CuI RbClO4 AlPO4 Cd(OH)2 Is the answer the first and second?

asked by Diana on April 27, 2016
57. ## Chemistry

Calculate the [OH-] for a solution in which [H+] is 1000 times greater than [OH-]? and will the final result be acidic, basic, or neutral?

asked by Colin on February 25, 2012
58. ## Chemistry

How many milliliters of an aqueous solution of 0.138 M potassium nitrate is needed to obtain 19.4 grams of the salt?

asked by Ashlei on July 3, 2017
59. ## chemistry

Three solutions 56.0 mL of 0.2 M KNO3; 57.0 mL of 0.6 M Ca(NO3)2; and 57.0 mL of 0.325 M KCl were poured together to make one new solution. What is the concentration of Cl− after mixing?

asked by selom on September 15, 2014
60. ## Chemistry

A saturated solution of sodium nitrate at 70oC is cooled to 40oC.  How many grams of precipitate are formed?

asked by Leah on May 6, 2012

A laboratory assistant needs to prepare 325 mL of 0.110 M CaCl2 solution. How many grams of calcium chloride will she need?

asked by Jasmin on November 9, 2010
62. ## chemistry

calculate the enthalpy of mixing for the solution of 10% platinum and 90% gold .express your answer in units of kg/mole

asked by himani. on May 7, 2013
63. ## Chemistry

If vinegar sample #1 requires 29.05 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?

64. ## geometry

Which of the following choices represents a type of problem with an angle as a solution? cos0 Arcsin 0.5 secB tan60

asked by D.J on April 23, 2018
65. ## chemistry

What is the expected van't Hoff factor for NaC2H3O2 in an aqueous solution, assuming 100% dissociation.

asked by kyle on December 6, 2010

Would a precipitate form if 200 mL of 0.006 M AgNO3 were added to 700 mL of a 0.005 M solution of K2CO3?

asked by Student12 on July 4, 2017
67. ## chemistry

Calculate the pH of a buffer solution prepared by mixing equal volumes of 0.20 M NaHCO3 and 0.10 M Na2CO3. (Ka = 4.3 x10-7)

asked by Anonymous on March 17, 2017
68. ## Chemistry

Why is a dilute solution of boric acid H3BO3 used as an eyewash? How does it work in cleansing the eye from chemicals?

asked by Jonah on March 20, 2013
69. ## Chem 2

What is the molal concentration of a solution made by dissolving 34.2g of sucrose (C12H22O11) (molar mass 342.34)

asked by Cassidy on December 17, 2012
70. ## Math

Find the smallest positive integer n such that the equation 455x+1547y=50,000+n has a solution (x,y) where both x and y are integers

71. ## chemistry

Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 3.63. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10. I'm completely lost help please!

asked by Linda on May 23, 2013
72. ## Chemistry

Calculate the solubility of silver iodide in a 1.0 M sodium cyanide solution. Ksp = 8.5 x 10^-17 for AgI Kform = 2.5 x 10^5 for Ag(CN)2

asked by Erin on April 7, 2010
73. ## Chemistry

How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer?

asked by Kiko on October 13, 2014
74. ## maths

please help find the general solution of the following first order differential equation. dx/dt = tx + 6t(exp)-t^2 pls show working

asked by micheal on October 26, 2011
75. ## Biology

Which of the following is true about an acidic solution? a. it's pH is below 7 b. its hydrogen ion concentration is low c. it is neutral d. it can act as a buffer

asked by Anonymous on August 1, 2018
76. ## Chemistry

Molarity What is the final volume (in Liters) of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

asked by Sara on May 1, 2015
77. ## Chemistry

Calculate the [H+] of a solution obtained by mixing 1 L of hydrochloric acid 1.0 M with 1 litre of sodium hydroxide 0.990 M.

asked by Katie on May 11, 2012
78. ## chemistry

calculate the molality, molarity, and mole fraction of NH3 in an 12.80 mass % aqueous solution (d=0.9651 g/ml)

asked by maria on September 8, 2014
79. ## chemistry

A 200.0mL solution with 3.1 x 10^-3 mol of MA will begin to precipitate at 19.4 C. Calculate each of the following at this temperature. a) Ksp b)change in G

asked by KAMILAH on April 13, 2014
80. ## chemistry

Can the ph of a buffer solution of potassium hydroxide decrease when exposed to air overnight? I'm pretty sure the answer is yes

asked by Sarah on August 13, 2013
81. ## Math

I have tried to figure out this problem and I just don't seem to understand. Could someone please help? I need to write a solution in interval notation for x

asked by B.B. on April 8, 2010
82. ## maths

find the general solution of the following first order differential equation. dx/dt = t*x + 6*t(exp)-t^2 pls show working

asked by micheal on October 26, 2011
83. ## chemistry

If 0.075 g of MgF2 dissolves per liter of solution, calculate the solubility-product constant. I got 2.0e-9 but it was not correct.

asked by Rebekah on April 27, 2011
84. ## intermediate algebra

solve an inequality and indicate the solution set, in interval notation. i need the steps that way i can study it and try to do the rest on my own. 3x+1>2andx-2

asked by suzy on September 25, 2012
85. ## algebra

Pleas help with this. Explain the steps so I can understand what I am doing. solve 0.3x + 9

asked by algebra on September 11, 2009
86. ## Chemistry

Can i please get a formula to calculate the concentration of an acid when it reacts with a standard solution? ( preferably 0.1 M NaOH and viniger )

asked by Daniel on August 5, 2010
87. ## Precalculus

10x^2=2^x Hi! How do I go about solving an equation like this? It's meant to be a calculator solution but I'd love to know how it's done by hand. Logarithms maybe? .. Thank you in advance (:

asked by Kay on November 6, 2015
88. ## science

I need help with balancing redox reactions Balance in acid solution: 1) PH3+ I2 --> H3PO4+ I- 2) ClO3- + Cl- --> Cl2

asked by Joseph on September 7, 2010
89. ## Quantitative Chemistry

Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 2.92. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10. Completely lost!

asked by Heather on July 23, 2012
90. ## Chemistry

Balance the following equation for a half reaction that occurs in acidic solution. Use e– as the symbol for an electron. Mo^3+ -> MoO2^2+

asked by Anon on December 2, 2012
91. ## Chemistry

What is the concentration of C2O4^-2 in a 0.370M oxalic acid solution? Ka1=5.6x10^-2 and Ka2=5.1x10^-5

asked by V on March 19, 2013
92. ## Chem 2

How many grams MgCl2 will be formed from 25.6 mL of a 0.100M HCl solution reacting with excess magnesium metal

asked by Cassidy on December 17, 2012
93. ## Chem

What mass of MgSO4 · 7H2O is required to prepare 700 mL of a 0.342MMgSO4 solution? Answer in units of g.

asked by Chandler on September 11, 2011
94. ## math143

2x3-4x2+23=y A.is(-4,-167) a solution? Show/explain b.is(3,51) a point on the graph c.give the y-intercept

asked by John on June 7, 2016
95. ## Chemistry

Dr bob for this question :Calculate the molar solubility of manganese II hydroxide in ph 12.85 solution. The Ksp is 2.1 x 10^-13 but I can't solve for x thanks.

asked by Anonymous on May 26, 2014
96. ## Chemistry

We are asked to find the pH of a buffer solution of Dinitrophenol and NaOH,with the necessary data given. Do they react at 1:1 ratio? What would be the products?

asked by Beth on July 19, 2017
97. ## Chemistry

The osmotic pressure of a liquid at 320 K is 145 kPa. Calculate the freezing point of the solution.

asked by David on November 29, 2011
98. ## Chemistry

You bubble ammonia in sulfuric acid solution. What is the result? (hint: remember, you start from NH3 (g))

asked by Anonymous on November 16, 2010
99. ## Math: Polynomial inequalities

Show all work solve the Math: Polynomial inequality and express the solution in set notation. 2t^2 - 3 < or = to t

asked by Anonymous on October 18, 2011
100. ## chemistry

Give the concentration in meters when 3.51 moles of HNO3 are dissolved in enough water to make 1.2 liters of solution

asked by Evan on March 5, 2012