# 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

91,718 questions, page 546
1. ## Chem

Calculate the pH of a solution obtained by mixing 50 mL of 0.75 M CH3COOH with 15 mL of 1.6 M NaOH. (Ka of CH3COOH is 1.8 x 10-5)

asked by Samara on January 21, 2017
2. ## Chem

How many millimoles of glucose are in 500 ml of a 1 M solution? I got 0.0005 millimoles, is this correct?

asked by Live on January 10, 2019
3. ## Chemistry

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 123.5 mL of 0.48 M H2SO4?

asked by Web on April 7, 2014
4. ## math

if there are 24 students and 5 less girls than boys , how many girls are in the class. I don't think there is a solution to this.

asked by Bre on January 23, 2017
5. ## algebra

Try graphing the following two equations. Eq 1 y = 2x + 3 Eq 2 y = 2x + 1 How are these two lines related? What is the solution for this systems of equations?

asked by bianca, pleeease help i'm lost on March 15, 2011
6. ## Chemistry

How many grams of Li2SO4 are needed to prepare 250.0 mL of a 4.0% m/v Li2SO4 solution?

asked by Debbie on April 30, 2011
7. ## Chemistry

How many grams of sucrose are needed to make 875 mL of a 39.0% (w/v) sucrose solution?

asked by Chemistry on January 27, 2013
8. ## AP Chemistry

A 0.00100 M solution of a weak acid HX is 6% ionized. Calculate Ka for the acid.

asked by Gabriella on January 24, 2014
9. ## Algebra

I need help refreshing my memory. How can you tell if a problem like this has a solution or not? 4x^2 I forgot how you can tell please refresh my memory. Thank you! :)

asked by Amy on February 5, 2009
10. ## Chemistry

What is the % by volume of an alcohol solution prepared from 35 ml alcohol and 350 ml of water?

asked by Nene on February 19, 2012
11. ## Chemistry

What is the % by volume of an alcohol solution prepared from 35 ml alcohol and 350 ml of water?

asked by Nene on February 19, 2012
12. ## chemistry

how much calcium is htere in 2.30 L of 0.0450 M calcium hydroxide solution ? pdf

asked by ashishs on February 6, 2012
13. ## chemistry

Find the pH of 1.0 x10-8 M KOH solution I tried to find it but i got 6 and that's acidic not basic.

asked by Austin on November 18, 2014
14. ## chemistry

the formula weight of h2so4 is 98. the weight of the acid in 400ml of 0.1M so the solution is?

asked by rahi on November 19, 2014
15. ## Chemistry

Equal volume. Of mixture of 2 solution with ph = 2 and ph = 12 find out the ph of the resultant mixture

asked by Akansha on October 11, 2016
16. ## Chemistry

What is the mole fraction of NaOH in an aqueous solution that contains 33.4% NaOH by mass?

asked by Grace Badaki on March 13, 2014
17. ## Chemistry

What mass of KCl is dissolved in 250. mL of a solution that is 4.00 % by mass/volume?

asked by Kiesha on December 1, 2010
18. ## Ochem

how many grams of NaOCl are in 12.14 mL of a 6.65% (wt./vol.) NaOCl solution? Please help me set this up... I have no idea what to do.

asked by Seerat on February 1, 2012
19. ## chemistry

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 132.0 mL of 0.21 M H2SO4?

asked by Anonymous on February 26, 2012
20. ## chemistry

What is the mole fraction of NaOH in an aqueous solution that contains 20.5% NaOH by mass?

asked by Anonymous on February 26, 2012
21. ## algebra,mathematics

Question 1 which of the following is/are true? A.(2/a-b) (b-a/2) =-1. B.If x=-1/2 and y=-2 then -x^2 - 4x/y +y^2=2 3/4. C.√1-x /√x-1 is defined for all x€R,x is not equal to 1. Question 2 The solution set of -x-√2x^2 +x -5 = 1 is 1.Q 2.{-2}

asked by enhle on April 13, 2015
22. ## Chemistry

Calculate the pH after 0.10 mol of HCl is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got 3.01, but it is wrong. What did I do wrong?

asked by Mary on March 27, 2011
23. ## Math

(square root of x+7)-5 = x Only the x+7 is square rooted how do I find the solution set???

asked by LT on February 3, 2009
24. ## chemistry

for a .001M solution of methionine: a) calculate the isoelectric pH b) calculate the isoionic pH

asked by Lana on April 7, 2013
25. ## chemistry

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 125.0 mL of 0.19 M H2SO4?

asked by MaryJ on November 4, 2010
26. ## chemistry

What mass of Ag2CO3 would be found in 1.4 L of a saturated solution if the Ksp of Ag2CO3 is 8.2 x 10-12?

asked by Chaitanya on April 19, 2008
27. ## chemistry

you have to prepare 200ml of a 0.2M NaCl solution. calculate the mass of NaCl you will need

asked by frieda on April 16, 2019
28. ## Science

If 0.30 mol NaCl goes into a solution with 4.00L water, the molarity of NaCl is

asked by Birdee on December 4, 2018
29. ## science

If the mass of solute 9.0 and the volume of solution is 250 mL, what is the solute's percent?

asked by RYAN on May 4, 2012
30. ## science

If the mass of solute 9.0 and the volume of solution is 250 mL, what is the solute's percent?

asked by RYAN on May 4, 2012
31. ## Chemistry

What volume of 0.716M KBr solution is needed to provide 10.5g of kBr?

asked by Rick on May 5, 2012
32. ## Algebra

Which inequality represents the solution set for the compound inequality below? -3

asked by Shevani, help me on April 22, 2013
33. ## Chemistry

will 1 molar NH3 and 1 molar NH4Cl form a buffered solution?

asked by Anonymous on March 25, 2010
34. ## Chemistry

Calculate the pH of an aqueous solution at 25 degress C that is .41 M in phenol (C6H5OH). Ka for phenol=1.3 x 10^-10.

asked by Natalie on December 8, 2010
35. ## Chemistry

What is the maximum concentration of Ca2+ ions in a solution containing 0.010 M of F- ions?

asked by Katie on May 10, 2012
36. ## Chemistry

A weak acid solution, HX 0.37 M, has a pH of 3.70. Calculate the acidity constant for this acid.

asked by Andrea on May 13, 2012
37. ## Chemistry

Can someone tell me if I am doing this problem right or if I need to start over? Thanks. pH = -log [H+] = -log (0.10) =1 The pH of 0.10M HCI solution is 1.

asked by Lisa on January 31, 2008
38. ## maths

The following quadratic equation has the integer solutions x^2+5x-6=0 what is the positive solution of the equation

asked by elizabeth on March 29, 2011
39. ## math

a,b and c are positive integers such that the simultaneous equations (a−2b)x=1, (b−2c)x=1 and x+25=c have a positive solution for x. What is the minimum value of a?

asked by ayan on April 24, 2013
40. ## Chemistry

How many grams of MGO are needed to prepare 2.5 L of a 0.5 molarity solution of MGO

asked by Brandy on November 20, 2018
41. ## Pre-Algebra

The problem is 6 + -x/2 = 14 My answer is x = 16. The "correct" answer is -16 but I don't understand this solution.

asked by Ryan on January 14, 2008
42. ## Chemistry

"blank" mL of 6.0 M H2SO4 are needed to prepare 300 mL of 1.0 M H2SO4 solution. its 49.8

asked by uci student on April 26, 2009
43. ## Chem1C

What is the pH of a 0.050M triethylamine, (C2H5)3N, solution? Kb for triethylamine is 5.3 x 10^-4 I have no idea how to start this, thanks.

asked by Jeff on April 22, 2009
44. ## Chemistry

Calculate the concentration of H+(aq) and the concentration of OH-(aq) for the following solution with the following pH at 298K showing all your working. pH = 3.20

asked by JJ on April 29, 2012
45. ## chemistry

What volume of 14 N H2SO4 is needed to make 250 ml of 3.2 N H2SO4 solution?

asked by Michelle on July 21, 2011
46. ## Chemistry

how much silver can you expect to isolate from 10mL of a 0.5 solution of silver nitrate. please help i would really appreciate it

asked by Tabatha on December 7, 2011
47. ## Chemistry

What is the volume of 0.05-molar HCl that is required to neutralize 50 ml of a 0.10-molar Mg(OH)2 solution?

asked by Abe on March 9, 2011
48. ## science

10ml of 1M H_2 〖SO〗_4 will completely neutralize 10ml of xM NaOH solution. what is the value of x

asked by KANNAN on August 12, 2016
49. ## Math

Find the real-number solution of the equation. 3x^7 = 81x^4 I got this far... 3x^7 - 81x^4 = 0 x^4 (3x^3 - 81) = 0

asked by Linda on December 7, 2011
50. ## chemistry

Find a pH of a 0.100 M solution of the weak acid HA. The pKa for the acid 5.0

asked by wallace on January 10, 2019
51. ## Chemistry

How many grams of NaCl are presented in 250g of salt solution containing 9% NaCl?

asked by Jessel on August 4, 2016
52. ## Chemistry

How much volume(mL)of 2.50 M NaOH(aq)must be added to 25.0 mL of water to produce a 1.50 M NaOH solution? Thanks!

asked by Jack on April 23, 2012
53. ## chemistry

78.7 mL sample of a 4.81 M sucrose solution is diluted to 12.0 mL. What is the molarity of the diluted soluti?

asked by Aamnda on December 4, 2011
54. ## Chemistry

if 1.7L of a saturated solution of AgC2H2O2 is found to contain 14.1g of AgC2H3O2. What is the Ksp of AgC2H3O2?

asked by Shirley on July 29, 2016
55. ## chemistry

What is the pH of a solution when 500ml of 0.2M NaOH and 500ml of 0.2M H2SO4 are mixed? Pls help.

asked by Amos & Jayson on April 26, 2012
56. ## Chemistry

Calculate the %(m/m) concentration of 6.00 M H2SO4. The density of the 6.00 M H2SO4 solution is 1.34g/ml.

asked by Tuan Le on December 17, 2014
57. ## Precalculus(URGENT)

compute the discriminant of the equation.What does the discriminant indicate about the kinds of solution? 7xsquared=2x-5

asked by Arielt -Help now fast due tommorow on April 1, 2010
58. ## chemistry

How many liters of a 0.530M sucrose (C12H22O11) solution contain 1.3kg of sucrose?

asked by rachel on October 26, 2010
59. ## chemistry

A chemist wants to make 3.1L of a 0.104M solution. How much KCl in grams should the chemist use?

asked by rachel on October 26, 2010
60. ## chemistry

A solution with a pH of 11.0 is A. neutral. B. acidic. C. weakly basic. D. strongly basic . HELP PLEASE!!

asked by 26kllt on May 29, 2012
61. ## science

solution of resultant displasement move toward 1.5m east then 2m south and then 4.5m toward east

asked by nitin kumar on July 21, 2012
62. ## Algebra

I also need help with (x)/(x+4)+(4)/(x+4)+2=0. My book says there is no solution, but I got one. I got -6 equals x (the x+4's cancel each other out so x+4 +2=0 is left. Then I subtracted the two, got x+4=-2. I subtracted the four and got x=-6).

asked by Jaymie on September 28, 2009
63. ## Chemistry

What is the molarity of a bleach solution containing 6.6 g of NaOCl per liter of bleach? answer please

asked by Dave on May 25, 2015
64. ## Chemistry

An exalic acid solution contain the following species in varyung species can only as C2H2O41

asked by Diana on May 25, 2019
65. ## Chemistry

If 15.0g of KCL is added to 100.0g of water at 30.0 C, how much more must be added to saturate the solution

asked by Jessica on September 23, 2012
66. ## CHEMISTY!!!!!!!!

If 15.0g of KCL is added to 100.0g of water at 30.0 C, how much more must be added to saturate the solution

asked by JOHN on September 23, 2012
67. ## Chemistry pH

What is the pH of a solution that is .60 M H2SO4 (Sulfuric acid) and 1.7 M HCOOH (formic acid).

asked by Karen on May 10, 2013
68. ## science

define the equivalents of one mole of glucose; L of solution, molecules of glucose, etc.

asked by brandon on September 8, 2011
69. ## University of Liberia , Chemistry

How much kcl in grams is contained in 0.488l of 1.25m kcl solution?

asked by Sesay kudee on October 28, 2017
70. ## chemistry

How many grams of HCL must be added to make 1 liter of a 2.0 M HCl solution?

asked by Rachael on September 27, 2012
71. ## Chemistry

How many grams of KBr are contained in 200 mL of a 0.310M KBr solution?

asked by Lauren on May 27, 2015
72. ## Chemistry

If a solution were to change its composition during freezing how do you think this would change the cooling curve.

asked by Chrissy on February 6, 2007
73. ## Chemistry

What volumes of 0.47 M HF and 0.47 M NaF must be mixed to prepare 1.00 L of a solution buffered at pH = 3.50? HF NaF

asked by Margaret on March 13, 2013
74. ## math

Identify the solutions of the systems of equations, if any. -4x-4y=8 4y=-4x-8 No solution (0,-2) (-2,0) Infinitely many solutions

asked by amber on September 2, 2014
75. ## chemistry

how many grams of water must be added to 75.5 grams of Ca(NO3)2 to for a 0.500 m solution

asked by Anonymous on December 9, 2009
76. ## biochemistry

if you dissolve 9 mg of glucose in 5 ml of water .what is the concentration of glucose in %w\v the resulting solution?

asked by Anonymous on March 27, 2015
77. ## chemistry

You are given an organic solution which reacts with most organic solvents. how would you obtain the IR spectrum of it?

asked by Maria on April 26, 2015
78. ## Diff Eq

If y(t)=3e^(t^2)is known to be the solution of the initial value problem y'+p(t)y=0, y(0)=y_0, what must the function p(t) and the constant y_0 be?

asked by Joe on September 7, 2012
79. ## Chemistry

What is the pH of a solution prepared by mixing 10 mL of 0.10 M NH3 and 5.0 mL of 0.24 M NH4+. Assume Ka(NH4+) = 5.56 x 10^-10

asked by Liz on November 11, 2012
80. ## Chemistry

The ksp of aluminum hydroxide is 5.6e-17. What is the concentration of hydroxide in a saturated solution?

asked by Kat on June 3, 2011
81. ## Chemistry AP

It was determined that a 0.10 M solution of an acid was only 2.5% ionkzed. Find the Ka and pKa for the acid.

asked by Jordan on March 16, 2013
82. ## Chemistry

How many grams of sucrose should be added to make 1 litre of 0.3M sucrose solution

asked by Omukule on October 18, 2017
83. ## chemistry

What volume of 6.58 M HNO3 is required to prepare 671 mL of a 2.7 M HNO3 solution?

asked by cheri on September 13, 2012
84. ## chemistry

If an alcohol solution has a pH of 5 would it be a primary, secondary or tertiary alcohol or a phenol?

asked by Anne on January 18, 2011
85. ## chemistry

the molarity of 2% by weight of aqueous solution of H2S4(molecular weight = 98)

asked by Samuel on July 5, 2013
86. ## Chemistry

How many grams of NaOH are needed to make 450mL of a 2.5%(m/v) NaOH solution?

asked by Telimm on July 1, 2015
87. ## Chemistry

How many milliliters of a 5.0 M H2SO4 stock solution would you need to prepare 111.0 mL of 0.36 M H2SO4?

asked by Dave on May 25, 2015
88. ## Chemistry

If 7 mL of water is added to 3 mL of a 0.50 M KOH solution, the concentration of KOH is changed to? I am not sure how to go about doing this. Please help, thank you!!! Would I do (7)(3) / 0.50?

asked by Hannah on October 11, 2011
89. ## chemistry

Calculate mole fraction of HCl in a solution containing 24.8% HCl by mass

asked by sahil on February 10, 2015
90. ## Chemistry

What property must a substance have if u want to use the substance to make an aqueous solution? Grade- 9

asked by Seastone on October 21, 2012
91. ## chemistry

How many grams of HCL must be added to make 1 liter of a 2.0 M HCl solution?

asked by Rachael on September 27, 2012
92. ## Chemistry

To prepare one liter of 2.5 M solution of HCl, what is the volume of concentrated HCl (37% p/p, d = 1.19 g/mL) to be used?

asked by Nadia on March 28, 2016
93. ## chemistry

How many grams of HCl must be added to make 1 liter of a 2.0 M HCl solution

asked by Chris on June 23, 2011
94. ## Geometry

Which equation has exactly one real solution? A 4x^2– 12x– 9 = 0 B 4x^2+ 12x+ 9 = 0 C 4x^2– 6x– 9 = 0 D 4x2+ 6x+ 9 = 0 Please teach me how to do this

asked by HELP PLEASE on June 8, 2015
95. ## physics

how many litres of 15%(mass/volume)sugar solution would it take to get 75g of sugar?

asked by Charika jakhar on August 15, 2014
96. ## Chemistry 3A

How many grams of KCl would you need to weigh out to prepare 0.25L of a 2.00 M KCl solution?

asked by Gurjot on December 10, 2012
97. ## Chemistry

I don't know why on earth I don't remember how to do this, but I can't, and it's so simple. Calculate [H+] and [OH-] of a solution with a pH of 9.7 Thank you.

asked by Anonymous on June 15, 2011
98. ## maths

for the sequence 1,4,7,11,13 find the 11th term of the sequence solution; Tn=a+(n-1)d T11=1+(11-1)3 1+(10)3 30

asked by adeleke on February 23, 2016
99. ## Math

Whats the solution of 2(h−8)−h=h−16? This has me stumped, can you also explain how to do this problem, so i can use that if i get stumped on another question?

asked by Clorox on September 20, 2018
100. ## algebra

-4r^2+21r=r+13 3s^2-26s+2=5s^2+1 Please, please could you be so nice and help me with step by step, I can't find right solution, Thank you so much!!!!

asked by Lucas on December 9, 2012