# 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 113
1. ## Chemistry

Concentrated hydrochloric acid is 38% HCl by weight and has a density of 1.19 g/mL. A solution is prepared by measuring 70 mL of the concentrated HCl, adding it to water, and diluting to 0.500 L. Calculate the approximate molarity of this solution from the

asked by JUNDY on March 15, 2015
2. ## math

The sides of two squares differ by 25cm while the sum of their areas is 2425cm. What is the length of the sides of each square. I know the answer--45&20 but I don't know the step by step solution. (40)-(20)=25 (40)^2+(20)^2=2425 2025+400=2425 Please give

asked by Nimuel on August 15, 2016
3. ## Chemistry

Hydroxylapatite, Ca10(PO4)6(OH)2, has a solubility constant of Ksp = 2.34 × 10-59, and dissociates according to Ca10(PO4)6(OH)2(s) --> 10Ca2+(aq) + 6PO43-(aq) + 2OH-(aq) Solid hydroxylapatite is dissolved in water to form a saturated solution. What is the

asked by Gabby on January 19, 2013
4. ## Science Check Please Dr.Bob222

I am sorry would..Hopefully this would make it easier 1. Your ____ is your first line of defense against pathogens. brain heart large intestine skin * 2. Blood vessels help regulate your body's temperature. When it's cold, your blood vessels ____ to

asked by YOLO on March 23, 2015
5. ## English

I really need you to check these sentences. Thank you. 1) Shakespeare meditates whether time is preordained or not inevitable, the result of human activity. 2) The concept of the universe as a cosmic dance was derived (induced) from the new scientific

asked by Henry2 on December 3, 2011
6. ## chemisty problem help

Carbon-12 contains 6 protons and 6 neutrons. The radius of the nucleus is approximately 70 pm. Calculate the volume of the nucleus and the volume of the atom. What percentage of the carbon atom's volume is occupied by the nucleus? Can someone tell me how

asked by Tagen on February 8, 2007
7. ## Novel

Heres what I have so far for the intro. of the novel. Let me know what you think and what needs to be fixed! For as long as I or anyone else could remember, I was always an excellent girl. All the neighbors invited me for tea or lemonade when I passed by

asked by mysterychicken on February 22, 2009
8. ## language arts

Which of the following statements best summarizes the "fiddler's bill" Bostonians had to pay for the tea party, as describes in 1 of chapter 7 from Johnny Tremain? A. The port of Boston was closed to all ships, and huge numbers of workers lost their jobs.

asked by kay on December 17, 2014
9. ## biology

When considering the incresing complexity of atoms, molecules, cells, and tissues, you may notice that each step characteristics that were absent in the previous level. These characteristics, called emergent properties, demonstrate that the whole organism

asked by cynthia on September 21, 2010
10. ## AP Bio

Antibodies are A. proteins or polysaccharides usually found on the cell surface of invading bacteria or viruses B. proteins that consist of two light and two heavy polypeptide chains C. proteins circulating in the blood that tag foreign blood cells for

asked by Mary on March 19, 2008
11. ## Chemistry Lab

Using the molarity of fromic acid (HCOOH): 0.1033 Calculate the percent by mass of fromic acid in unknown solution. Assume the density of aqueous fromic acid solution is 1.000 g/mL. Need help setting up this problem. Thank you.

asked by Thao on May 16, 2011
12. ## Chemistry

write 2-3 sentences describing and identifying the type of chemical reaction that occurs when Fe^2+ reacts with potassium permanganate and specifying the type of solution required for the reaction to occur I don't know what type of reaction this is or what

asked by Morgan on January 16, 2015
13. ## Chemistry

A 40.00 mL sample of 0.1 M NH3 is titrated with 0.150 M HCl solution. Kb = 1.8 * 10^-5 What volume of base is required to reach the equivalence point? What is the ammonium ion concentration at the equivalence point? What is the pH of the solution at the

asked by Emily on April 6, 2008
14. ## English

Writeacher, I urgently need your help to check a few things. 1) Which of them is the girl to whom you are enganged? 2) Paris, which I visited las year, is one of the most romantic cities I've been to/to which I've been/where I've been/where I've

asked by Matthew on March 21, 2012
15. ## chemistryyy

Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH

asked by Rachel on September 21, 2011
16. ## chemistryyy

Answer the following two questions about the equivalence point for the titration of 27.8 mL of 0.235 M hypobromous acid (pKa = 8.64) with 0.214 M KOH. 1)Predict if the solution will be acidic, basic or neutral at the equivalence point. 2)Calculate the pH

asked by Rachel on September 21, 2011
17. ## chem

In a solution at constant H+ concentration, iodide ions react with hydrogen peroxide to produce iodine. H+ + I- + 1/2H2O2 --> 1/2I2(aq) + H2O The reaction rate can be followed by monitoring the appearance of I2. The following data were obtained:

asked by Keith on May 10, 2007
18. ## English

I forgot to include the following examples.I urgently need to know if they are possible. 1) I usually ride my bike to school. My father drives his car to work. You can drive at 50 kilometers per hour on an Italian urban road. 2) You can drive at 130

asked by Henry2 on September 29, 2011
19. ## Physics

A copper wire with a criss section of 5 mm^2 and 2 km long has an effective resistance of 2Ohms. a) Find the power lost in this wire if 10000 W of power is put through it with 120 V of potential. [hint: use P=VI to get current first then P=I^2R] b) Express

asked by Lana on December 27, 2008
20. ## algebra 1

*I have asked countless people to help me with this story problem and nobody seems to know how to do it! Please help! Natalie performs a chemistry experiment where she records the temperature of an ongoing reaction. The solution is 93.5º C after 3

asked by Brittany on May 2, 2013
21. ## health, science

How can I explain Lung cancer to children? I don't know how to explain in easy words. "Lung cancer is the uncontrolled growth of abnormal cells in the tissues of the lungs. If not treated, lung cancer may spread to the surrounding tissues and other parts

asked by apple on May 7, 2017
22. ## physics

You're in an airplane that flies horizontally with speed 860 km/h (240 m/s ) when an engine falls off. Neglecting air resistance, assume it takes 26 s for the engine to hit the ground. Hight of airplane is: H = 3.3 km horizontal distance that the aircraft

asked by aaron on October 12, 2018
23. ## AP Chem (Conceptual Questions)

Hey guys! If you could just please, look over a few of these conceptual problems because I'm pretty confused? (I put what I think is the answer below each question). Thank you for any help in advance!!!! A.Which statement *does not* apply to a

asked by Allie on November 1, 2015
24. ## medical billing

8 year old male hemophiliac is admitted with acute blood loss anemia following uncontrolled bleeding. he was given 4 units of packed red blood cells via the peripheral vein. while in the hospital he also received his regular preventive infusion fo clotting

asked by Anonymous on July 25, 2013
25. ## AP Chem

A solution of potassium phosphate is mixed with a solution of calcium acetate. I am supposed to write a net ionic equation. Doesn't need to be balanced. Here is what I did: K3PO4(aq) + Ca(C2H3O2)2 --> KC2H3O2 + Ca3PO4 3K+ + PO4-3 + Ca+2 2(C2H3O2-) --> K+ +

26. ## Chemistry

the following questions are about colligative properties: a)How much would the freezing point change in a 2.5 solution of phenol in benzene? b)how much would the boiling point change in a 1.m solution of magnesium chloride in ethanol? c)Does adding sugar

asked by Kim on May 2, 2010
27. ## Chemistry

The following is given: 20 ml of HCl (2.0 M) added with 5 ml of Na2S2O3 (0.3 M) with 5 ml of H2O S2O3^-2(aq) + 2H^+1 (aq) --> S (s) + SO2 (g) + H2O (l) Calculate the following: a) Reaction rate when 30 mg of sulphur is formed (in 30 ml of solution) after

asked by Stephanie on October 20, 2010
28. ## Chemistry Help

How many milliliters of 0.534 M Ba(OH)2 solution are needed to completely neutralize 34.5 mL of 0.220 M HBr solution? The reaction is Ba(OH)2(aq) + 2HBr(aq) → BaBr2(aq) + 2H2O(l) I did 0.0345 * 0.220 = 0.00759 Moles of HCl =2*0.00759= 0.01518

asked by Matthew on February 27, 2015
29. ## Chemistry

Given a 1.00 M solution of NaOH, describe how you would prepare 500 mL of 0.05 M NaOH solution. You have a 500 mL volumetric flask and a graduated cylinder. I have been trying to figure this question out for over an hour now. I cant seem to place the given

asked by Chloe on November 20, 2014
30. ## chemistry

We have two liters of a buffer solution that is 0.10 M in CH3COOH and 0.10 M in NaCH3COO. How many moles of solid NaOH are to be added to this solution to increase its pH by 5.0 percent? Assume no volume change due to the addition of solid NaOH. I have the

asked by Bharg on April 15, 2010
31. ## Chemistry

A)How many moles of O2 are required for the complete combustion of 2.2 g of C3H8 to form CO2 and H2O? b)A 65.25 g sample of CuSO4•5H2O (M = 249.7) is dissolved in enough water to make 0.800 L of solution. What volume of this solution must be diluted with

asked by Kristi on May 16, 2012
32. ## Chem

How do I do this problem Assume you dissolve 2.56 g of malic acid, C4H6O5, in half a liter of water (500.0 g). Calculate the molarity, molality, mole fraction, and weight percent of acid in the solution. (Assume the final volume of the solution is 500. mL)

asked by Ann on July 24, 2011
33. ## Metals

Transition metals (also called heavy metals) form insoluble compounds with hydroxide ions. Therefore, it is possible to extract heavy metal ions from water by raising the pH. The precipitation reaction between cadmium(II) and hydroxide is shown below.

asked by Chemistry on April 19, 2015
34. ## chemistry II

What is the molarity of a solution of acetic acid if 35.00mL is titrated to the end point with 68.20ml of 0.750M KOH? What is the percentage by mass of acetic acid solution? The density of acetic acid is 1.06 g/ml

asked by Steph on February 1, 2015
35. ## Chemistry

Calcium chloride has been used to melt ice from roadways. Given that the saturated solution is 32% calcium chloride by mass, estimate the freezing point. Express your answer in degrees Celsius. Assume that calcium chloride behaves ideally in solution.

asked by Frank on September 14, 2010
36. ## chem 101

State,in a stepwise fashion how 250mL of a 0.100m sodium hydroxide solution can be made from sodium hydroxide pellets. .. Then calculate the needed volume of solutions above. ,in order to make a diluted 5L solution of 0.05m sodium hydroxide

asked by pelonomi Tito on February 10, 2016
37. ## health

All of the following are true regarding smoking EXCEPT: - Smoking inhibits the T cells from working properly in the lungs - Smoking is viewed by many today as being socially unacceptable - Research shows that the nicotine patch is no no more effective than

asked by Melissa on November 19, 2008
38. ## Algebra 2

Is the solution to this rational expression extraneous? The problem: (2x-3)/7 -(7x)/14 My answer: x = -9/4 My teacher wants to know if the solution is extraneous and I know I have to plug my answer back into the expression to check but I still don't

39. ## Chemistry

Make 50.0 mL of a 0.500 M solution of acetic acid (CH3COOH) from the 1.00 M CH3COOH using a 50.0 mL graduated cylinder. 1. Show your calculations and explain how you made the acetic acid solution.

asked by Kate on February 25, 2015
40. ## Math

Use the quadratic formula to solve the equation for x in terms of y and y in terms of x. (Enter your answers as a comma-separated list. If there is no solution, enter NO SOLUTION.) 2x^2 + 7xy + 1 − y^2 = 0 (a) x in terms of y x = (b) y in terms of x y =

asked by Liam on September 14, 2014
41. ## Chemistry

A glucose solution contains 55.0g of glucose C6H12O6 in 475g of water. Compute the freezing point and boiling point of the solution. Assume a density of 1.00g/mL for water.

asked by Monica on September 18, 2012
42. ## math

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. A basic solution has a pH of 11.2. An acidic solution has a pH of 2.4. What is the approximate difference in the concentration of hydrogen ions

asked by Anonymous on March 9, 2016
43. ## Quatitative Analysis

What is the correct charge balance equation for an aqueous solution of MnCl2 that ionizes to Mn2 , Cl–, MnCl , and MnOH ? What is the correct mass balance equation for the same solution?

asked by Whitney on September 17, 2013
44. ## math

A hallway measuring 90 feet x 7 feet requires 1/2 a fluid ounce of cleaning solution per square foot. How much cleaning solution is required to clean the hallway

asked by Anonymous on June 11, 2014
45. ## chemistry

for an aqueous solution having Calcl2 (2molar) and Mgcl2 (5molal) and specified gravity of solution is 1.145 calculate molality of chloride ion and molality if chloride ion.

asked by riya on May 10, 2013
46. ## Chemistry

A 21.18 mL of 0.250 M NaOH is titrated with a H2SO4 solution. The initial volume of H2SO4 was 13.28 and the final volume of H2SO4 was 28.29 mL when the solution turned very slightly pink. What is the concentration of H2SO4?

asked by Ivy on December 7, 2010
47. ## Freezing solution

An ethylene glycol solution contains 26.2g of ethylene glycol (C2H6O2) in 81.4mL of water. Calculate the freezing point of the solution. (Assume a density of 1.00 g/mL for water.) how do I set this up?

asked by Chemistry on April 27, 2015
48. ## Chemistry - Equilibrium

Silver ion concentrations are needed for a solution. You have 0.050 M AgNO3, if you added 5.0mL of 12. M NH3 to 500.mL of this solution, how much silver ion in M will you have at equilibrium? [Kf for Ag(NH3)2+ is 1.5 x 10^7]

asked by Shawn on April 25, 2012
49. ## chemistry

How would you prepare a solution of about 8mg/100ml of ascorbic acid in water (25ml)? I'm not sure if they mean to use that ratio of ascorbic acid in water to make a 25 ml solution or if the wording means something else.

asked by solution chemistry on February 22, 2014
50. ## working with school aged children

Which of the following is the final step in problem solving? A. Implement the solution. B. Rule out possible solutions. C. Decide who owns the problem. D. Test the solutions. I would think it would be D since u would have to do the rest of them before you

asked by Heather on May 16, 2011
51. ## chemistry

An isotonic solution contains 0.86% by mass per volume. Calculate the percent mass per volume for an isotonic solution of KCl at 30 degrees C. Assume a van't Hoff factor of 1.9.

asked by Anonymous on February 3, 2011
52. ## Science

I need to find out if sucrose, sucrose solution, sodium chloride, sodium chloride solution, water, vinegar, and aluminum are electrolytes and what type of bond they are but I don't know where to look.

asked by Anonymous on December 20, 2009
53. ## Geography

What happened to the population of New Orleans during and after Hurricane Katrina? People stayed to protect property. People evacuated and returned slowly. People evacuated, but almost all returned. People evacuated and did not return. C is false, the

asked by Anonymous on November 23, 2015
54. ## chemistry

please check if I did this right ... calculate the mass of white solid CaCO3 that forms when 98ml of a 0.1M Ca(NO3)2 solution is mixed with 54 ml of a 2.5M Na2CO3 solution. Ca(NO3)2 + 2NaCO3 -> Ca(CO3)2 + 2NaNO3 .098*0.1 =.0090 .054*2.5 =.135 limiting

asked by Krissy on January 29, 2010
55. ## chemistry 112

A volume of 60.0mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 19.2mL of 1.50 M H2SO4 was needed? The equation is

asked by Sam on October 7, 2014
56. ## chemistry

The enthalpy change for the solution process when solid sodium hydroxide dissolves in water is -44.4 kJ/mol. When a 13.6 g sample of NaOH dissolves in 250.0 g of water in a coffee-cup calorimeter, the temperature increases from 23.0 o C to __________ o C.

asked by Anonymous on November 15, 2010
57. ## Chemistry

What does ammonia have anything to do with bogdan's rocket building? -can't find this anywhere if we had to order ammonia we don't order in pure. it is ordered in clandestine, liquid solution. the ammonia exists in this aq solution in eq. what is the eq

asked by Xi on October 27, 2008
58. ## Chemistry

What does ammonia have anything to do with bogdan's rocket building? -can't find this anywhere if we had to order ammonia we don't order in pure. it is ordered in clandestine, liquid solution. the ammonia exists in this aq solution in eq. what is the eq

asked by Xi on October 27, 2008
59. ## math

The lengths in inches (x and y) of two fish are related by the equation 5x – 4y = 24. The two ordered pairs that follow are solutions to the equation: (4, -1) (12,9) Which statement best evaluates whether these two solutions make sense in this situation?

asked by samone on November 4, 2013
60. ## Chemistry

how would you prepare 250 mL of 0.69M Al2(SO4)3 solution from a 2.0M Al2(SO4)3 stock solution?

asked by Cass on July 30, 2014
61. ## chemistry

A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3.

asked by Monique on November 6, 2011
62. ## chemistry

In a .25 M solution, a weak acid is 3.0% dissociated. A. calculate the pH of the solution B. calculate the Ka of the acid Please explain steps.

asked by anonymous on March 19, 2012
63. ## Pharmacy Math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

asked by Betty on July 30, 2012
64. ## pharmacy math

Rx Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?

asked by Anonymous on March 3, 2014
65. ## pharmacy math

RX Potassium Chloride 3:5 solution 30ml. how many millimeters of a potassium chloride 2:5 solution do you need to prepare the order?

asked by cleondra on August 12, 2012
66. ## Chemistry

a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution

asked by Scott on May 31, 2014
67. ## Chemistry

A sulfuric acid solution that is 65.0% H2SO4 by mass has a density of 1.55 g/mL at 20°C. What is the mass of h2so4 per liter of solution?

asked by Veronica on May 31, 2014
68. ## chemistry

you must prepare 300 mL of .750M NaBr solution using 2M NaBr stock solustion. how many mL of stock solution should you use?

asked by abby on March 17, 2011
69. ## chemistry

how many milliliters of .400M hydrogen Monobromide solution can be made from 50mL of 8M hydrogen monobromide solution?

asked by sandraaa on April 8, 2014
70. ## Math

Write the equations described below. a) an addition equation with one variable that has a solution of 3 b) a subtraction equation with one variable that has a solution of 2/3

asked by Bryn on February 6, 2018
71. ## math

A salt solution of 15 litres contains 20%salt. How much water must you add to salt solution, in order to dilute it 15% salt?

asked by HEMENDU KUMAR on December 19, 2016
72. ## Chemistry

how would you prepare 250 ml of 0.69m al2(so4)3 solution from a 2.0 al2(so4)3 stock solution

asked by Sam on July 29, 2014
73. ## math

what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

asked by tasu on June 15, 2016
74. ## math

how many liters of distilled water must be added to 80 liters of 60% acid solution to obtain a 50 % acid solution?

asked by pau on August 29, 2015
75. ## DrBob222-re: chem question

Sorry, I did make an error when I posted the earlier question: It should have said: A solution has [OH-] = 2.0 x 10-^14 M. The [H+] in this solution is? I hope you can help. Thank you. Sorry about the earlier error.

asked by Cassandra on April 23, 2015
76. ## 180g/l

I want to make up a 180g/l solution acid using 98% Sulphuric Acid. How much H2SO4 do I use should I make a stock solution first.

asked by Jillian on September 22, 2014
77. ## chemistry

I fyou had only 12g of KOH remaining in a bottle, how many ml of 12.8%(w/v) solution could you prepare? (in mL) How many ml of 0.29 M solution could you prepare using 12 g of KOH?

asked by nicole on November 21, 2010
78. ## chemistry

Potassium 2:5 Chloride solution 30ml. How many milliliters of a potassium chloride 3:5 solution do you need to prepare the order?

asked by chi on July 28, 2014
79. ## Algebra 1

What is the solution set for an equation in which all numbers work? How big is the solution set for an equation that cannot be solved?

asked by Wendy on October 7, 2009
80. ## Pharmacy Math

How much stock solution of hydrogen peroxide 8% will you need to make 320ml of hydrogen peroxide 2% solution? ____

asked by Jean on July 30, 2012
81. ## Algebra

how much pure acid must be added to 15 ounces of an acid solution which is 40% acid in order to produce a solution which is 50% acid?

asked by Anonymous on January 12, 2014
82. ## science

what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

asked by tasu on June 15, 2016
83. ## Science

calculate the mass of sodium nitrate in grams in a 150 ml solution of a 5.00 M solution of sodium nitrate

asked by Stephanie on April 19, 2011
84. ## Chemistry

If a basic solution has a pH of 11.88, is it considered to be a strong base? Is an acidic solution with a pH of 4.44 considered to be a strong acid?

asked by Jessica on December 10, 2015
85. ## chem

How do you prepare a solution of 12 M HCl and want to prepare 500 mL of a 0.4 M solution. Assume you have a 500-mL volumetric flask

asked by maggie on October 16, 2012
86. ## College Algebra

How much water must be evaporated from 32 ounces of a 7% salt solution to make a 8% salt​ solution? (Answer is in ounces)

asked by Ana on August 27, 2017
87. ## Chemistry

a stock solution of perchloric acid is 75.5% perchloric acid and has a density of 1.67g/ml. What is the molarity of the solution?

asked by Michelle on November 23, 2012
88. ## Chemistry

You have a stock solution of 13.4 M NH3. How many milliliters of this solution should you dilute to make 100.0 mL of 0.100 M NH3

asked by Nancy on October 15, 2010
89. ## hum 111

How does the process of refining a solution for a problem differ from the process of refining a solution for an issue? Which do you think is more challenging?

asked by Anonymous on October 25, 2012
90. ## DON VASCO PATNA

A salt solution of 15 litres contains 20% salt.How much water must you add to salt solution in order to dilute it 15% salt?

asked by YATHART on November 21, 2014
91. ## Chem

Can you show me step by step how to do the following problems? How many grams of KI are in 25.0 mL of a 3.0 % (m/v) KI solution? How many milliliters of a 2.5 M MgCl2 solution contain 17.5 g MgCl2?

asked by Kariann on March 29, 2011
92. ## algebra

how many liters of distilled water must be added to 80 liters of 60% acid solution to obtain a 50 % acid solution?

asked by cheszka on June 8, 2017
93. ## Math

Solve the following system of equations. x + 4y= 8 (1) x=5-4y (2) What is the solution of the system? (Type an ordered pair. Type N if no solution).

asked by Melinda on August 2, 2008
94. ## Biology

You need to prepare 270ml of a 20% sucrose solution (w/v). Sucrose has a molecular formula of C12H22O11. How would you prepare this solution?

asked by Anonymous on January 19, 2015
95. ## chemistry

describe how you would prepare from the specified stock solution: 400 mL of 0.45 M urea starting with a 6 M urea stock solution

asked by luv2swim on July 24, 2011
96. ## Chemistry Lab

You need 123 mL of 0.245 M NaOH solution for a certain experiment, and the only solution available in the lab is 1.252 M. How many mL OF THE 1.252 M NaOH would you need?

asked by Thao on May 10, 2011
97. ## chemistry

Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+ and Fe 3+ in this solution?

asked by Ash on February 12, 2013
98. ## Chemistry

How do we prepare 500mL of 0.5 percent w/v solution of NaOH if we have stock solution of 50 percent w/v NaOH on hand?

asked by Stacy on October 12, 2012
99. ## chemistry

How many liters of water must be added to 4 liters of a 6 molar HNO3 solution to create a solution that is 2 molar?

asked by Hiba on September 14, 2010
100. ## Math

How many milliliters of pure acid must be added to 150 milliliters of a 70% solution of acid to obtain a 80% solution?

asked by Anonymous on February 18, 2013