# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 15
1. ## Chemistry

How do you calculate the pH of two acids in a solution? Examlp: a solution is made by adding 50mL acetic acid(Ka=1.76x10-5) to 50mL 1.00x10-3M HCl. What is the Ph of the solution?

asked by Steve on November 5, 2012
2. ## chemistry

25.0cm3 of a solution containing 2.0g of NaOH per 250cm3 of a solution of H2SO4 for complete neutralization. Calculate the concentration of the acid solution in (i) mol/dm3 (ii) g/dm3? (H = 1.0, O = 16.0, Na = 23.0, S = 32.0)?

asked by poppy on April 18, 2019
3. ## chemistry

A beaker contain 300.ml of a 0,20 M Pb(NO3) solution. If 200 ml of 0,20M solution og MgCl2 is added to the beaker, What will be the concentration of Pb2+ ions in the resulting solution

asked by mathew on October 12, 2014
4. ## science: chemistry

A buffered solution is made by adding 47.4 g C2H5NH3Cl to 1.00 L of a 0.68 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

asked by Julie on July 23, 2015
5. ## AP Chemistry

If 400 mL of 3.2 molar HCl solution is added to 300 mL of 2 molar NaOH solution, what will be the molarity of NaCl in the resulting solution? Answer in units of M

asked by Gabriella on January 30, 2014
6. ## Calculus-HELP!!!

Find a general solution to the first – degree ordinary differential equation. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible: dx/dt=sqrt(x+t+1)

asked by Sara on July 8, 2013
7. ## Analytical Chemistry

25.0 mL of a 0.1067 M Solution of nickel (II) sulfate is diluted to 250 mL with water. 10 mL of this solution is taken and diluted to 1.0 L. Calculate the concentration of [Ni2+] in the final solution in ppm.

asked by Anonymous on February 11, 2014
8. ## Chemistry

A buffered solution is made by adding 48.6 g C2H5NH3Cl to 1.00 L of a 0.77 M solution of C2H5NH2. Calculate the pH of the final solution. (Assume no volume change. Assume that all solutions are at 25°C.)

asked by Margaret on March 13, 2013
9. ## Math

a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma

asked by Nancy on March 1, 2012
10. ## Chemistry

You have a vinegar solution you believe to be 0.8 M. You are going to titrate 21.39 mL of it with a NaOH solution that you know to be 0.774 M. At what volume of added NaOH solution would you expect to see an end point? Answer in units of mL

asked by Sara on March 11, 2014
11. ## chemistry

calculate the osmotic pressure of a solution obtained by mixing 100ml of 0.25M solution of urea and 100ml of 0.1m solution of cane sugar at 293k

asked by sumit on June 6, 2013
12. ## Chemistry

We have an aqueous solution that contains 22% (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215 g/mol. The density of the solution is observed to be 1.1 g/mL. What is the molarity of Z in this solution?

asked by El on March 28, 2016
13. ## Chemistry

A solution is prepared by mixing 8 mL of .2 M Fe(NO3)3, 10mL of .001 M NaSCN, and 7 mL of .1 M HNO3 a. calculate the concentration of Fe3+ in the solution b. calculate the SCN- in the solution

asked by Anonymous on February 20, 2011
14. ## AP Chemistry

If 400 mL of 3.5 molar HCl solution is added to 200 mL of 2.3 molar NaOH solution, what will be the molarity of NaCl in the resulting solution? Answer in units of M.

asked by Zach on February 24, 2016
15. ## Chemistry

calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride

asked by Amy on March 29, 2015
16. ## Grade 11 Chemistry

calculate the molarity of cl- ions in a solution made from mixing 50.0 ml of a 0.100 m/l solution of ferric chloride with 50.0 ml of a 0.500 mol/l solution of ammonium chloride

asked by Sim on March 28, 2015
17. ## Chemistry

If 12.90 mL of a 18.2 Weight% solution of sodium chloride is diluted to a final volume of 3.00 liters, what is the Molar concentration of the diluted solution? The density of the original solution is 1.12 g/mL.

asked by Danielle on January 23, 2011
18. ## chemistry

HB, pH=1 To neutralize 10cm3 it took 5.00cm3 NaOH 10cm3 of the solution HB are diluted with water to make 1 litre of solution. The pH of the new solution is 3. Show that HB is the strongest acid.

asked by Anonymous on November 24, 2009
19. ## Chemistry!

HB, pH=1 To neutralize 10cm3 it took 5.00cm3 NaOH 10cm3 of the solution HB are diluted with water to make 1 litre of solution. The pH of the new solution is 3. Show that HB is the strongest acid.

asked by Anonymous on November 24, 2009
20. ## chemistry

If the endpoint in the titration of KHC8H4O4 solution with the NaOH solution is mistakenly surpassed, will the molar concentration of NaOH solution be reported too high or too low?

asked by Kerapetsi on May 7, 2013
21. ## Chemistry

Consider an aqueous solution that contains 22 % (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215.2. The density of the solution is observed to be 1.12 g/mL. What is the molarity of Z in this solution? Answer in grams

asked by Susan on May 7, 2014
22. ## General Chem

What do you call a solution that is maid by mixing solid Na2S2O3 5H20 with NaOH? Also, what is the complete balanced equation for mixing the above solution with an aqueous solution of NaClO? Thanks anyone!

asked by Mark on June 22, 2011
23. ## Chemistry

A 10.0-mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the following additions of the HCl solution: a) 0.00 mL b) 10.0 mL c) 20.0 mL c) 30.0 mL d) 40.0 mL **I know how to solve the problem but I keep getting

asked by Sandhya on March 21, 2015
24. ## Chemistry

A solution is prepared by dissolving 130 g of NaNO3 in 100 g of water at 80°C. The solution is cooled to 0°C. How many grams of compound remain in solution? How many grams of solid are formed?

asked by George on April 3, 2011
25. ## Chemistry

Explain why the FeCl3-KCI-HCl solution was used as a reference solution. Suggest a procedure you could follow to determine whether it was necessary to use this solution as a reference or whether distilled water would have been just as satisfactory.

asked by Alyssa on July 10, 2013
26. ## STEVE or REINY-plz help!

Find a general solution to the first – degree ordinary differential equation. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible: dx/dt=sqrt(x+t+1) Thank you in advance for your help! =)

asked by Elyse on July 8, 2013
27. ## Differential equations,Calculus

So I have the following differential equation. The general solution I have is: t=k(-1/r)+c I now need to find the particular solution when t=0 and the radius (r) = 1cm. So k is a constant which is approx 3.9 (5/4pi) So for the particular solution im really

asked by Anon on February 22, 2017
28. ## chemistry

A solution is prepared by adding 1.00 g of solid \rm NaCl to 50.0 mL of 0.100 M \rm {CaCl_2}. What is the molarity of chloride ion in the final solution? Assume that the volume of the final solution is 50.0 m

asked by jared on October 2, 2011
29. ## Chemistry

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

asked by Emma on March 25, 2013
30. ## chemistry

a 500ml stock solution of NAOH has a purity of 70% and a density of 1.9g/ml. calculate the concentration that would be in a 1L solution. calculate the molarity. What volume would we have to take to prepare 250ml of a solution of 0.1 mol/l

asked by helen on March 12, 2016
31. ## Chemistry

A solution is prepared by dissolving 130 g of NaNO3 in 100 g of water at 80°C. The solution is cooled to 0°C. How many grams of compound remain in solution? How may grams of solid are formed?

asked by Craig on April 3, 2011
32. ## chem

15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.22 M lead(II) nitrate solution. What is the concentration of phosphate ions left in solution after the reaction is complete? A) 0.0 M B) 0.045 M C) 0.13 M D) 0.060 M E) 0.12 M

asked by Bogdanam on December 15, 2010
33. ## chemistry

A sulfuric acid solution containing 571.8gg of H2SO4 per liter of solution has a density of 1.329 g/cm3 Calculate the mole fraction of H2SO4 in this solution.

asked by jordan on January 16, 2014
34. ## chemistry

What is the molarity of the acetic acid if 0.5ml of a vinegar solution has been titrated with the 0.101M solution of NaOH and the volume of the NaOH solution at the equivalence point is 5.0mL?

asked by RC on May 13, 2013
35. ## chemistry

A solution is prepared by dissolving 0.20 mol of acetic acid and 0.20 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

asked by Anonymous on April 23, 2009
36. ## Chemistry

What is the activity coefficient of H^+ in a solution containing 0.073 M HCl and 0.0090 M Ca(ClO4)2? What is the pH of the solution? I believe I have to find the ionic strength of the solution first, but I don't know how to find it when 2 solutions are

asked by Sam on February 4, 2013
37. ## AP Chemistry

A 0.500 M HNO3 solution was used to titrate a 21.15 mL KOH solution. The endpoint was reached after 22.30 mL of titrant were delivered. Find the molar concentration of KOH in the original solution.

asked by Rebecca on February 4, 2018
38. ## chemistry

A solution is prepared by dissolving 0.20 mol of acetic acid and 0.20 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

asked by Anonymous on April 23, 2009
39. ## chemistry

A solution is prepared by dissolving 0.20 mol of acetic acid and 0.20 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

asked by Anonymous on April 23, 2009
40. ## Chemistry

A 635 mL solution of HBr is titrated with 0.51 M KOH. If it takes 1569 mL of the base solution to reach the equivalence point, what is the pH when only 141 mL of the base has been added to the solution?

asked by Taylor on September 27, 2016
41. ## Chemistry

A 635 mL solution of HBr is titrated with 0.51 M KOH. If it takes 1569 mL of the base solution to reach the equivalence point, what is the pH when only 141 mL of the base has been added to the solution?

asked by Taylor J on September 27, 2016
42. ## Business English

What are two or three solution that might improve the efficiency of my office What does each solution involve and how much work and money is required to introduce that change How exactly does each change solve the problem? which is the best solution at

asked by Joycelyn on November 21, 2008
43. ## Chemistry

30cm of 0.3molar solution (0.3mol) were diluted to 0.1molar solution(0.1mol) by addition of water calculate A. The new molar solution B. Volume of water added

asked by Turuchukwu on February 28, 2013
44. ## Chemistry

The concentration of the stock solution will be approximately 7.50 x 10-5 M. How many milliliters of this stock solution is needed to prepare 50.0 mL of a 1.20 x 10-5 M solution? (Express your answer in the correct number of significant figures.

asked by Jen on January 31, 2019
45. ## Chemistry

1 liter of a 1 M lithium hydroxide solution is added to 1 liter of a 1 M barium chloride solution, and a precipitate forms. What ions are left in solution after the reaction is complete?

asked by Olivia on November 13, 2011
46. ## chemistry

To 160.0 mL of a buffer solution containing 0.250 M ammonia and 0.100 M ammonium chloride, 20.00 mL of 1.00M HClO4 are added. a) Calculate the pH of the new solution. b) What becomes the pH if another 20.00 mL of the same acid solution is added?

asked by faizer on February 15, 2013
47. ## chemistry

how much of a 1.50M solution sodium sulfate solution in milliliters is required to completely precipitate all the barium in 150.0mL of a 0.250 M barium nitrate solution

asked by Monique on November 6, 2011
48. ## chemisrty

A 21.00 sample of 0.3254M Hcl solution requires 26.09 ml of NaOH solution for complete neutralization. Calculate the volume of NaOH solution in liters, required for the titration.

asked by ashley on April 25, 2013
49. ## AP CHEMISTRY

SOMEONE PLEASE EXPLAIN AND ANSWER THIS QUESTION : Will Co(OH)2 precipitate from solution if the pH of a 0.034 M solution of Co(NO3)2 is adjusted to 9.45? (Ksp of Co(OH)2 is 1.3 10-15) Support your answer by calculating the ion product (Q) of the Co(OH)2

asked by HELP PLEASE on March 13, 2012
50. ## Chemistry

A solution is prepared by dissolving 0.12 mol of acetic acid and 0.12 mol of ammonium chloride in enough water to make 1.0 L of solution. Find the concentration of ammonia in the solution.

asked by Emma on March 24, 2013
51. ## chemistry

dimethylglyoxime is used as a reagent in qualitative analysis to precipitate the nickel(II) ion. a solution is made by dissolving 57.0 grams of DMG in 430.0 g of ethanol. (a) what is the mole fraction of DMG in this solution? (b) what is the molality of

asked by Anonymous on May 5, 2010
52. ## Food Analysis

1.If 0.5l of 5M solution of CU(NO3) is diluted to a volume of 0.80l by adding water, what is the molarity of the resulting diluted solution? 2.How many ml of water will be required to dilute 11ml of 0.45Macid solution to a molarity of 0.1M? 3.Calculate the

asked by Sarah on March 8, 2011
53. ## Chemistry PLEASE HELP!!!

'A buffer is prepared by mixing a 100.omL of a 0.100 M NH3 solution with a 0.200M solution of NH4CL solution and making the total volume up to 1.000L of water. What is the volume of NH4Cl solution required to achieve a buffer at ph=9.5? Ka of

asked by jemima on December 11, 2012
54. ## chemistry

this is a lab i am working on and this is what is says: Solution A is mixed with water to produce solutions of varying concentration. These altered concentrations of solution A is added to a set amount of solution B and the reaction times are noted when

asked by Arnold on January 5, 2012
55. ## Chemistry

Is my answer in 3 sig fig or 4 sig fig?? A solution is prepared by dissolving 12.80 g of magnesium chlorite in enough water to make 200.0 mL of stock solution. A 25.0 mL aliquot (portion) of this stock solution is then removed and added to 250.0 mL of

asked by Anonymous on October 20, 2013
56. ## Math

an 8% solution, a 10% solution, and a 20% solution of sulfuric acid are to be mixed to get 100 milliliters of a 12% solution. How many milliliters of each must be mixed if the volume of the 20% solution must be 25 milliliters less than the volume of the

asked by Matt on March 20, 2017
57. ## psychology

A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of

asked by summer on September 12, 2011
58. ## Chemistryyy

a) A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid? b) A 0.150 M sodium chloride

asked by Xaxus on September 12, 2014
59. ## Property of logarithms

Using property of logarithms, how do I prove derivative of ln(kx) is 1/x First observe that ln(kx) = ln(k) + ln(x) then take derivatives. The ln(k) is simply a constant so it goes away. You could also derive it as d/dx ln(kx) = 1/kx * k by the chain rule.

asked by Jen on October 20, 2006
60. ## Physics

You push an air-hockey puck along a surface with negligible friction while riding in a truck as it moves at a constant velocity in Earth's frame of reference. What do you observe? Why? I'm tempted to say that the puck moves forward because that's all I can

asked by Katja on March 1, 2009
61. ## Chemistry

I need help starting this question: A buffer solution is prepared by adding 30.0g of pure acetic acid to 41.0g of sodium acetate in water, and then diluting the solution to 1.00L. What is the pH of the buffer solution?

asked by a Canadian on April 4, 2013
62. ## chemistry

10. An aqueous solution is prepared by diluting 3.30 mL acetone, CH3COCH3, (d=0.789 g/mL) with water to a final volumeof 75.0 mL. The density of the solution is 0.993 g/mL. What is the molarity and molality of acetone in this solution?

asked by Anonymous on April 3, 2012
63. ## calculus

solve the logarithmic equation. be sure to reject any value of x that is not in the domain of the orginal logarithmic expression. In square root x+7=2 what is the exact solution? a.)the solution set is ? b.)there are infinitely many solutions c.)there is

asked by Brock on January 1, 2013
64. ## Chemistry. Help please

Calculate the pH of a buffer solution made by mixing 174 mL of a 1.68M trimethylamine (CH3)3N solution with 250 mL of a 1.08M trimethylammonia chloride, (CH3)3NHCl solution.

asked by Stephanie on December 9, 2010
65. ## chemistry

A KNO3 solution is made using 88.4g of KNO3 and diluting to a total soultion volume of 1.50l. Calculate the molarity and mass percent of the solution. Assume a density of 1.05 g/mL for the solution.

asked by Monique on November 6, 2011
66. ## Chemistry

I need help starting this question... A buffer solution is prepared by adding 30.0g of pure acetic acid to 41.0g of sodium acetate in water, and then diluting the solution to 1.00L. What is the pH of the buffer solution?

asked by a Canadian on April 11, 2013
67. ## Chemistry

Use Ksp to find the concentration of an ion in a saturated solution. Consider a 2.50E-3 M solution of Al2(SO4)3. (a) What [OH^-] is required to initiate precipitation of Al^3+ from the solution? (b) What [OH^-] is required to lower the [Al^3+] to 2.00E-7 M

asked by Jo on July 28, 2012
68. ## Chemistry - Science (Dr. Bob222)

Ammonia is a weak base with a Kb of 1.8 x 10-5. A 100.0 mL sample of 0.13 M aqueous solution of ammonia (NH3) is mixed with 87 mL of 0.15 M solution of the strong acid HCl, calculate the pH of the final solution. A) 2.9 B) 11.1 C) 8.8 D) 5.2 E) None of the

asked by Ana on May 6, 2014
69. ## Chemistry

If 32.0 mL lead(II) nitrate solution reacts completely with excess sodium iodide solution to yield 0.545 g precipitate, what is the molarity of lead(II) ion in the original solution?

asked by Hel P. on September 15, 2011
70. ## ACS

Whatis the molarity of an HCl solution if 25mL of this solution require 19.58mL of 0.1062M Sr(OH)2 solution for complete reaction? The reaction is give below Sr(OH)2 + 2HCl --> SrCl2 + 2H2O

asked by Debro on November 21, 2007
71. ## chemistry

if the endpoint in the tritration of the KHC8H4O4 solution with the NaOH solution is mistakenly surpressed(too pink),will the molar concentration of the NaOH solution be reported too high or too low?explain

asked by jiska on May 8, 2013
72. ## Chemistry

If 258 mL of 2 molar HCl solution is added to 342 mL of 4.3 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution? Answer in units of M.

asked by Avery on March 1, 2016
73. ## Chemisty

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution?

asked by Kate on January 14, 2014
74. ## physical science chemistry

If 25 cm^3 of the potassium hydroxide (KOH) solution was used to neutralise 35cm^3 hydrochloric (HCl)solution, determine the concentration of the hydrochloric acid solution. Thanks

asked by jonathan on June 17, 2015
75. ## science

A 60.0-mL 0.508 M glucose (C6H12O6) solution is mixed with 115.0 mL of 2.43 M glucose solution. What is the concentration of the final solution? Assume the volumes are additive.

asked by Kiana on February 27, 2011
76. ## Chemistry

The molarity of amonia in aqueous solution is 11.8 mole/dmc calculate the amount of fraction of amonia in solution density of solution is 0.916 g/cc

asked by Aman on August 10, 2013
77. ## Calculus

Find a general solution to each first ¨C degree ordinary differential equation. If an initial condition is given, find the corresponding particular solution. Write solution explicitly if possible. dx/dt=¡Ì(x+t+1)

asked by Elyse on July 6, 2013
78. ## AP CHEM

If 488 mL of 2.9 molar HCl solution is added to 191 mL of 2.8 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution? Answer in units of M.

asked by Kinsey on March 3, 2016
79. ## AP Chemistry

If 435 mL of 2.7 molar HCl solution is added to 128 mL of 3.2 molar Ba(OH)2 solution, what will be the molarity of BaCl2 in the resulting solution? Answer in units of M

asked by Gabriella on January 30, 2014
80. ## Chemistry

A solution is prepared by adding of KOH to 1 liter of water. The resulting solution has an [OH negative]of 1 * 10 negative 3. What would be the pOH of this solution? Can you show me how you came up with this answer? Thank you.

asked by Tia on April 27, 2011
81. ## Chemistry II

A solution is prepared by placing 72.8 g of magnesium chloride in 120 g of water at 22oC. a)What is the boiling point of the solution? b)What is the freezing point of the solution?

asked by Chase on September 16, 2009
82. ## chemestry

calculate the pH of the 120mL of a 0.12 M HCOONa,Ka=1.8*10^-5,solution are added to 50mL of a 0.05 M H2SO4 solution.Determine the pH of the sodium formate solution before and after the H2SO4 addition. please someone help me!

asked by Anonymous on June 25, 2016
83. ## Chemistry

work out the [OH-], [H+] and pH of the solution formed when 0.500L of 0.250 M hydrochloric acid solution is mixed with 0.500 L of a 0.250 M calcium hydroxide solution.

asked by Megan on July 22, 2012
84. ## chemistry

A solution is prepared by dissolving 15.0 g of NH3 in 250.g of water. The density of the resulting solution is 0.974 g/ml. The mole fraction of NH3 in the solution is?

asked by CC on March 5, 2010
85. ## Biochem

A buffer solution is prepared by mixing 200 mL of 0.2 M salt solution and 400 mL of a 0.2 M acid solution. What is the concentration of the resulting buffer? ~what is the pKa?

asked by Dr. Nick on November 19, 2012
86. ## chemistry

you dissolve 6.55g of potassium nitrate in enough water to make a 250ml solution. if you add 1.25 l of additional water to this solution.what is the molarity of this new solution.

asked by cateye on April 22, 2012
87. ## chemistry

a solution containing 13.75g of barium hydroxide is to be neutralized with a 0.150 mol/L phosphoric acid solution. what volume of the acid solution will be required?

asked by Maxine on February 15, 2016
88. ## Chemistry

A 10.0 mL solution of 0.300 M NH3 is titrated with a 0.100 M HCl solution. Calculate the pH after the addition of 20.0 mL of the HCl solution. (potentially useful info: Ka of NH4+ = 5.6 x 10−10)

asked by Nat on July 17, 2013
89. ## chem

how do you prepare a solution using the proper lab equipment(both from dry solid and a stock solution) i researched it but all i found was the definition for stock solution any help please!!

asked by lyne on February 12, 2009
90. ## Chemistry

A chemist needs to prepare a buffer solution of pH 8.80. What molarity of NH3 (pKb = 4.75) is required to produce the buffer solution if the (NH4)2SO4 in the solution is 1.8 M?

asked by Cortney on May 6, 2015
91. ## Algergra

I am stumped! I have been working on these problems for the longest time and I can not figure out what I am doing wrong. Some how when I get to the last two steps I mess up, and I am beyond frustrated. The directions say: Write an equation of the line

asked by Kay on September 26, 2008
92. ## Physics

What would be the radius (φmax, in degrees) of a glass bow? The glass beads have an index of refraction n=1.5. We spread them out on the ground and we observe a glass bow as the sun is high in the sky.

asked by Anonymous on May 30, 2013
93. ## Chemistry

When 100 mL of Ba(NO3)2 solution at 25 degrees Celsius is mixed with 100 mL solution CaSO4 solution at 25 degrees Celsius in calorimeter, the white solid BaSO4 forms and the temperature of the mixture increases to 28.1 degrees Celsius. Assuming that the

asked by Megan on December 9, 2012
94. ## science

A ball is dropping from the roof and the window of 3m where a boy observe ball cross window in 0.5sec find the distance of wall above the window

asked by Jagrati on September 14, 2016
95. ## Chemistry

A solution of 0.316 M KOH is used to neutralize 16.0 mL H3PO4 solution H3PO4(aq) + 3KOH(aq) ¨ K3PO4(aq) + 3H2O(l) If 30.3 mL KOH solution is required to reach the endpoint, what is the molarity of the H3PO4 solution? Molarity = ____________

asked by LuigiR on November 19, 2015
96. ## Grade 10 Math

Write an equation that forms a system of equations with x + y = 4, so that the system has: a) No solution b) Infinitely many solutions c) One solution I know how to figure out if two linear systems have a solution, but I don't understand how you could

asked by Rebecca on March 5, 2011
97. ## science

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl.

asked by Kyle on January 5, 2015
98. ## Help

Is there a website that will help me solve this? I can't find anything. I'm coming up with x=1/3 but I feel I'm doing it wrong. Find all real number solutions to (cubed root 3x-8)-1=0 If there is more than one solution, separate them with commas. If there

asked by Hannah on January 27, 2011
99. ## Chem I

Calculate the concentrations of hydronium and hydroxide ions in a solution prepared by dissolving 0.345g of solid NaOH in enough water to make 225mL of solution. Also calculate the pH and pOH of the solution.

asked by Natalea on November 15, 2010
100. ## Chemistry

Why is a blank solution used in absorption spectroscopy? I know it is to nullify the reflection, refraction, and diffraction that occurs, but if the blank solution was a dilute solution rather deionized water, how would the concentration of Cr(VI)in a

asked by Sandy on February 25, 2014