# Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. 2x + 10y = 58 -14x + 8y = 140

91,330 questions, page 469
1. ## Math

For the following equations, write a word problem draw a picture, and find the solution to the equation: 5/12 - 1/3= 1/2 - 2/3=

asked by Anonymous on October 9, 2009
2. ## chemistry

describe how you would prepare 500ml of a solution containing 0.025M sodium acetate and 0.001% w/v starch.

asked by Anonymous on February 10, 2013
3. ## chemistry

What volume of a 0.553 M calcium hydroxide solution is needed to exactly neutralize 7.34 grams of KHP

asked by Pam on April 9, 2015
4. ## Math

Use substitution to determine whether the ordered pair (–2, –3) is a solution of the equation x^2 – y = 7 I say no, but am still not sure because the signs are confusing. Am I correct? Thanks!

asked by Crystal on June 12, 2009
5. ## Chemistry

Hi please help with this. You will mix 5 ml of each 2M HCL and 2M NaOH solutions, calculate the concentration of NaCl formed in the new solution?

asked by John on October 17, 2010
6. ## Chemistry

20cm3 of 0.1m sulphuric acid was required to react with 50.0cm3 of a solution of sodium hydroxide

asked by Aliyah on October 26, 2016
7. ## Chemistry

Ca(OH)2 has a Ksp of 6.5 x 10^-6. If 0.37 g of Ca(OH)2 is added to 500 mL of water and the mixture is allowed to come to equilibrium, will the solution be saturated?

asked by Kervin on November 18, 2012
8. ## Chemistry

If 2.50 mol. of sodium chloride was required to make up a solution of a particular concentration, what mass would need to be measured out?

asked by Deanna on March 20, 2015
9. ## Algebra 1

Choose the correct solution in roster form. N is the set of natural numbers that are factors of 12. {1, 2, 3, 4, 6} {1, 2, 3, 4, 6, 12}** {1, 2, 3, 4, 5, 6, 8, 12} {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}

asked by Anonymous on October 26, 2016
10. ## Chemistry

What is the total mass of KNO3 that must be dissolved in 50 g of water at 60 degree C to make a saturated solution?

asked by Michael on March 22, 2016
11. ## chemistry

the molarity of a solution composed of 25.4g KHCO3 diluted with water to a total volume of 200 mL

asked by Colin on October 18, 2011
12. ## Calculus

(1 pt) Find the unique solution to the differential equation y"?5y'+6y=?312sin(2t) satisfying the initial conditions y(0)=?31 and y'(0)=?18

asked by Hannah on December 3, 2010
13. ## Chemistry

Ca(OH)2 has a Ksp of 6.5 x 10^-6. If 0.37 g of Ca(OH)2 is added to 500 mL of water and the mixture is allowed to come to equilibrium, will the solution be saturated?

asked by Kevin on November 18, 2012
14. ## Calculus

Find the unique solution to the differential equation y"?1y'?6y=?24(t^2)+10t+41 satisfying the initial conditions y(0)=?6 and y'(0)=?26

asked by Hannah on December 3, 2010
15. ## Analytical Chemistry

Determine the pH of a solution that is generated when 2.623 g Na3PO4 is added to a 100mL of 0.0800 M H3PO4.

asked by Kevin on July 24, 2013
16. ## Chemistry

If a 45.3-g sample of potassium nitrate is dissolved in enough water to make 225 mL of solution, what will be the molarity?

asked by Kevin on February 2, 2012
17. ## chemistry

If 36.3 ml of 0.152M NaOH is required to neutralize 25.00 ml of an HC2H3O2 solution ,what is the molarity of the acetic acid?

asked by HJ on September 11, 2012
18. ## algebra

(d)are the strategies that you listed in step(c)equally viable? might any of them yield a solution to the problem more readily than others? if so, why?

asked by Darrin on October 2, 2010
19. ## chemistry

What is the molality of a solution made by adding 0.130 g of zinc sulfite to 151 ml water?

asked by Dorothy on March 1, 2014
20. ## chemistry

Acids and Bases: What would be the pH of a solution made by adding 16.9 grams of hydrochloric acid to 2.50 L of water?

asked by Marinas on November 22, 2013
21. ## chemistry

How much BaCl2 would be needed to make 250 mL of a solution having same concentration of Cl^- as the one containing 3.78g of NaCl per 100 mL?

asked by jaimi on April 16, 2015
22. ## Chemistry

Determine the concentration for the following solutions 2.0g KOH is dissolved in water to make 200.0 ml of solution

asked by Sara on February 23, 2017
23. ## Chemistry

Given that Kw for water is 2.4× 10–14 at 37 °C, compute the pH of a neutral aqueous solution at 37 °C, which is the normal human body temperature.

asked by John on October 20, 2011
24. ## chemistry

Would u expect the boiling point of a solution to change if u added a non-volatile solute such as KCl?

asked by 123 on November 7, 2010
25. ## Chemistry

Identify the solvent and the solute in vinegar, a dilute aqueous solution of acetic acid.

asked by Danny on April 13, 2010
26. ## Chemistry

Balance the following redox reaction in acidic solution: H3PO4 + HNO2--> N2O4 + H3PO3

asked by Kynlee on May 10, 2011
27. ## Chemistry

What is the PH of a 0.747M sodium cyanide solution (NaCN) knowing that the Ka of Hydrocyanic acid is 4.9x10-10?

asked by Ab on March 23, 2019
28. ## Chemistry

Hydrogen cyanide is a weak acid with Ka = 4.9 x 10-10. Calculate the pH of a solution (to 2 decimal places) containing 2.28 g of Sr(CN)2 per 158 mL.

asked by Andrew on January 7, 2008
29. ## chemistry

You need to make a solution containing 150 g of potassium chloride in 300 g of water. What temperature is required?

asked by Anonymous on April 19, 2012
30. ## chemistry

Calculate the pH of a 3.00×10-4 M solution of the strong acid HClO4. Round your answer to 3 significant digits.

31. ## Chemistry

If 0.370 g of Ca(OH)2 is added to 500 mL of water and the mixture is allowed to come to equilibrium, will the solution be saturated?

asked by Caitlin on December 3, 2017
32. ## english

I really need someone to write me a short formal letter of complaint that presents a problem and suggests a solution. Please help!!

33. ## Chemistry

250ml solutions is prepared on dissolving 20g NaOH. Calculate the molarity of solution

asked by Diwaker on July 25, 2016
34. ## Chemistry

What is the hydronium ion concentration in a solution 0.150M in HNO2 and 0.300M in NaNO2? Ka = 7.24E-4

asked by Alexis on April 14, 2013
35. ## chemistry

o make 100mL of a solution that is .25M in chloride ion, how many grams of MgCl2 would you need to dissolve

asked by samantha on September 16, 2007
36. ## Chemistry

How could tell a copper (II)sulfate solution from lead (II)nitrate or sodium sulfite if the solutions were not labeled ?

asked by Jackson on February 13, 2011
37. ## Chemistry

How much water must be added to 6 mL of a 0.05M stock solution to diltue it to 0.02M ? The answerI got is 15 mL. Is this correct? Thanks

38. ## Chemistry

Why would copper (II) sulfate solution react with iron to produce 3 CuSO4(aq) + 2 Fe (s) = 3 Cu (s) + Fe2(SO4)3 (aq)

asked by Victoria on May 22, 2014
39. ## chemistry

Which solution would increase the osmotic pressure of water the most? a) KBr b) NaCl c) MgCl2 d) glucose

asked by Donna on May 19, 2008
40. ## chemistry

For a solution that is 0.280M HC3H5O2 (propionic acid, Ka= 1.3*10^-5) and 0.0894M HI , calculate the following: [H3O+] [OH-] [C3H5O2-] [I-]

asked by Saunders on April 14, 2011
41. ## College Chem

Calculate the number of grams required to make 250 mL of a 0.020 M KIO3 solution.

asked by Kelli on October 3, 2010
42. ## Chemistry

What volume of 5% vinegar solution is needed to neutralize 1.0g of baking soda if density is 1.01g/ml

asked by Marianna hutchinson on December 6, 2013
43. ## AP chemistry

1). In a titration 20 mL of 0.100 M of HCl is added to 50.0 mL of 0.150 M of ammonia. A). What is the pH of NH3? B). What is the pH of the resulting solution? HELP :(

asked by Amanda on March 21, 2013
44. ## science

which solution is made entirely of gases? cough syrup,soda,helium,or clean air.

asked by tricia on September 29, 2011
45. ## Chem 2

Using the reaction HB H+ + B- and the Ka for that expression, calculate the Ka given the initial concentration of weak acid to be 0.150 M and the pH of the solution to be 2.79.

asked by Myssey on July 27, 2012
46. ## chemistry

phenol is insoluble in NNAHCO3 solution while acetic acid is soluble.give reason.

asked by nat on July 14, 2011
47. ## Chemistry

Which of the following will be more soluble in an acidic solution than in pure water? Be(OH)2 Ag2SO4 RbClO4 CuCN Cul

asked by Anon on March 14, 2013
48. ## Chemistry

What ratio of molar concentrations of sodium acetate to acetic acid can buffer a solution at a pH of 4.89?

asked by Samantha on March 27, 2017
49. ## analytical chemistry

What is the pH of a solution formed by mixing 14.35 mL of 0.200 F HCl with 0.322 g of Na3PO4, followed by dilution to 500.00 mL?

asked by Jonny on December 4, 2007
50. ## Science

What kind of a solution will you create if you add 17g of table salt to 50g of wAter at o'c?

asked by John mark Lomboy on June 25, 2016
51. ## chem

calculate the amount of water that must be added to 6.5 grams of urea to produce a 22-2% by mass solution?

asked by anthoony on January 28, 2012
52. ## Chemistry

Calculate the pH of a solution created by adding 5.00g of LiF to 150.0mL of 1.25M HF. Ka = 7.2 x 10-4

asked by A on March 7, 2013
53. ## Chemistry

200 g of CH3COOH are dissolved in enough water to make 1.5 L. What is the molarity of the acetic acid solution?

asked by Andrea on May 13, 2012
54. ## chemistry

if I have 1.60g of urea, how much water, in grams, should be added in the preparation of a 23.1 percent by mass solution?

asked by Anonymous on March 13, 2014
55. ## Chemistry

What will the pH of a solution be when 0.5447 L of NaOH (pH = 14.436) is added to 0.357 L of 2.01 M ascorbic acid (H2C6H6O6)? Not sure how to do this.

asked by Anonymous on June 29, 2016
56. ## Maths, physics, chemistry,

The weight of H2C2O4.2H2O required to prepare 500 ml of 0.2N solution is a)126g b)12.6g c)63g d)6.3g

asked by Deepak on April 29, 2017
57. ## Chemistry

How many grams of sodium sulphate (mol. wt. 142) are required to make 1.2 liters of 0.5N solution

asked by Frank on September 19, 2013
58. ## Science

Will adding30g of SO2 to 100g of water at 0 degrees C create a staurated solution? Explain

asked by Anonymous on February 9, 2011
59. ## Chemistry

what is the accetic acid solution when 30ml .15M NaOH have been added to 50ml .1M HOAc?

asked by Gabby Gonzalez on May 24, 2011
60. ## College Chemistry

How many grams of Al would be deposited from an aqueous solution of Al3+ with a current of 1.430A after 5hrs of deposition.

asked by Jude on May 3, 2011
61. ## Chemistry

In water at 25°C, which of the following is the most basic solution? a) pH = 3 b) pH = 0 c) [OH-] = 10-13 M d) [H3O+] = 10-13 M My assumption is is OH- 10^-13, but I am not confident, is this some sort of trick question?

asked by Daniel on January 19, 2015
62. ## Chemistry

What are the concentrations of acetic acid (pKa = 4.76) and acetate in a buffer solution of 0.15 M at pH 4.5? Please help me do this problem. I have no idea how to do it.

asked by Emma on April 27, 2016
63. ## chemistry help

what mass of ammonium chloride can be added to 100g of water at 20 degrees C before the solution becomes saturated

asked by kate on May 28, 2009
64. ## science

the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10

65. ## Chemistry

What is the osmotic pressure of a solution made from dissolving 60.0g of glucose, C6H12O6, in 450 mL of water at 10.0∘C?

asked by Ashleigh on September 2, 2014
66. ## chemistry

explain how you would make 200. mL of a 0.150 M solution of calcium chloride, if provided with the solid

asked by Anonymous on September 26, 2013
67. ## Math

Can someone check this for me please... 4x + 8 >= (that is greater and equal to) 4 and 2x - 13 >= -5 the solution: {x|x>= 4} on the graph the highlighted line goes to the left...is this correct?

asked by Carmen on November 2, 2008
68. ## Chemistry

To make the following saline solution(375ml 0.5%w/v sodium chloride) what would you weight out? what volume of water would you use?

asked by Danny on October 22, 2010
69. ## chemistry

if you have 100 ml each of 1.0 m solutions of NaCl,KCl, and CaCl2 which solution would have the largest mass? explain..

asked by lilly on April 28, 2011
70. ## Calculus

write and row reduce the augmented matrix to find the general solution. x + y - z = 7 2x - y - 5z = 2 -5x + 4y + 14z = 1 3x - y - 7z = 5

asked by Amy on January 27, 2014
71. ## chemistry

what mass of potassium hydroxide is required to produce 2.00L of a solution mthat has a pOH of 4.5?

asked by judi on May 8, 2010
72. ## chemistry

Explain in a written statement how you would make 200.0 mL of a [Cl-] = 0.172 M solution starting with CaCl2

asked by gordon on December 15, 2010
73. ## chemistry

What is the final volume if 125 mL of a stock solution of nitric acid at 10.30 M is diluted to 0.500 M?

asked by Anonymous on April 14, 2015
74. ## Chemistry

Determine the fluoride ion concentration for a saturated solution of magnesium flouride. (Ksp = 7.4E-11)

asked by Kelsey on October 30, 2017
75. ## CHEM

How many grams of magnesium chloride are needed to prepare 100ml of a 0.325 M MgCl2 solution?

asked by Lisa on February 7, 2013
76. ## Algebra 1

I am trying to find the solution for y-9>-17 and I don't know where to start. i have been out of school for nearly 30 years and none of the info makes any sense. please help..thanks

asked by Amanda R on August 28, 2010
77. ## Chemistry

what is the accetic acid solution when 30ml .15M NaOH have been added to 50ml .1M HOAc?

asked by Gabby Gonzalez on May 24, 2011
78. ## chemistry

calculate the molality of a solution that has 1.02kg sucrose C12H22O11 dissolved in 554g water?

asked by gabriela on April 10, 2017
79. ## chemistry

If 33.4 mL of the base are required to neutralize 11.1 mL of hydrobromic acid, what is the molarity of the potassium hydroxide solution?

asked by Anonymous on May 2, 2012

A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?

asked by Alexandra on September 29, 2013
81. ## science

what type of solution is formed when steam from boiling water evaporates into the air? explain.

asked by Jon on October 7, 2010
82. ## Chemistry

What is the OH^- concentraton of a solution that is 0.10M in Na2C2O4? I have a couple of these concentration questions asking different things but I don't know how to do them

asked by LT on April 14, 2008
83. ## Chemistry

What volume of 0.170 M K3PO4(aq) must be added to 50.3 mL of 0.103 M K2HPO4(aq) to prepare a buffer solution with a pH of 12.09?

asked by Jamie on October 21, 2014
84. ## chemistry

what are the factors that determine the mass of solute that will dissolve in a giben amount of solvent or solution?

asked by bonnie on June 6, 2011
85. ## Math

Can someone please help with this? I am helping my niece with this problem:7x>_49. Here is what I have: x>_7. The solution is:{x|x>_7}. The graph is: a solid dot on the 7 going to the right. Is this correct?

asked by B.B. on April 16, 2010
86. ## Chemistry

Name the product obtained on passing cabon(2) oxide into saturated potassium trioxocarbonate(4) solution.

asked by Yaseerah on May 20, 2015
87. ## solubility graph

if 20 g of sodium chloride are dissolved in 100 cm3 of water at 20gC, is the solution saturated?

asked by tony on November 10, 2008
88. ## Math

Determine which ordered pair is not a solution of y= -5x - 4. (10,-52) (7,-39) (-7,3) (8,-44) I think it is (10,-52) Pls help I always mix up graphing coordinate planes!

asked by 7 dream kid on November 19, 2018
89. ## science

the volume of nh3 at stp needed to pass into 30 ml of 1N h2so4 solution to bring down its strength to m/10

90. ## Science

calculate the mass of NaOH required to make 500ml of 0.5Molar aqueous solution

asked by Shanton on January 2, 2018
91. ## chemistry

what mass of potassium chloride is required to prepare 5.00L of a 2.00M solution of KCL

asked by TROUBLED on October 24, 2011
92. ## chemistry

If 50ml of 0.1M NaOH are mixed with 35ml of 0.1M HCL will the solution be acid, base or neutral? why?

asked by Anonymous on October 9, 2010
93. ## chemistry

what are the equilibrium concentrations of Pb2+ and F- in a saturated solution of lead (II)flouride if the Ksp for PbF2 is 3.2*10^-8?

asked by Victoria on December 7, 2012
94. ## CHEM

How many grams of sodium chloride are required to prepare 1.00 liter of a 1.00M NaCl solution?

asked by Lisa on February 7, 2013
95. ## Chemistry

How much ethylalcohol must be added to 1litre of water so that the solution will freeze at 14 farenite, kf of wa ter is 1.86 c/mol

asked by Ria on February 22, 2017
96. ## Chemistry

which salt solution would have the highest ph and why KI,KBr,KF,KCL or they all have the same ph. Im leaning towards KF since im pretty sure the other salts are neutral?

asked by Sean on February 19, 2017
97. ## science

the volume of nh3 at stp needed to pass into 30 ml of in h2so4 solution to bring down its strength to m/10

98. ## Chem II

Calculate the pH and percent ionization for the solution made up of 0.035 M NH3 and 0.015 M NH4Br.

asked by Ken on April 14, 2008
99. ## chem

If 20 g KCL is dissolved in 100g of water at 20 degrees C, is the solution unsaturated, saturated, or supersaturated?

asked by tom on May 28, 2009
100. ## chemistry

Which of the following is a weak electrolyte in aqueous solution? a. H2SO3 b. HNO3 c. HBr d. HClO4 e. NaOH

asked by zacky on March 23, 2010