# 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 538
1. ## chemistry

1. NaOH has a MW of 40. A 0.12M solution is made by adding how much NaOH to 100mL of water?

asked by jenny on December 8, 2011
2. ## Chemistry

What mass of MgCl2 should be dissolved in 75.0 g H2O to produce a solution that is 38.5% solute by mass?

asked by SR23789 on September 12, 2017
3. ## algebra

simplify the following radical expression: 4 sqrt (625) a) 5 b) sqrt (25) c) 25 d no solution exists''. a

asked by kiddo on June 23, 2010
4. ## Chemistry

If your Copper(II)sulfate solution contains 0.8 grams of Cu and you recovered 0.76 grams of it, what would be the percent yield?

asked by Beandip on March 20, 2014
5. ## college

A solution was diluted by a factor of 2 and then again using a 1 to 3 dilution. What is the dilution of concentrate in the final sample

asked by alyemi on May 26, 2009
6. ## chemistry

What is the solubility of BaSO4 in a solution of 0.250 M Na2 SO4 ? The Ksp of BaSO4 is 8.7 x 10-11.

asked by elaine haizel on August 29, 2016
7. ## science

NaOH has a MW of 40. A 0.12M solution is made by adding how much NaOH to 100mL of water?

asked by jake on December 9, 2011
8. ## Math

What is the pH of buffer solution prepared with 0.05 M ammonia & 0.05 M ammonium chloride? The Kb value of ammonia is 1.80 ✖️ 10^-5 at 25C.

asked by Neth on July 20, 2016
9. ## chemistry

You have 333 mL of alkaline solution at pH = 11.1. You wish to neutralize this by reacting it with 222 mL of acid. What must be the value of the pH of the acid?

asked by barco on May 31, 2013
10. ## chemistry!

What volume of solvent should be added to 36.8 g of CH3OH to produce a 0.500 M solution of CH3OH?

11. ## chemistry

How many moles of ions (cations and anions) are contained in 1.2 L of a 1.9 M solution of KCl? KCl K+ + Cl-)

asked by megan on April 24, 2012
12. ## chemistry

A soluction of 100 mL of 0.2 M NH3 is titratedwith 50 mL of 0.5 M HNO3. What is the pH of the resulting solution? Kb for NH3 is 1.8 × 10−5 1. 5.30 2. 1.00 3. 1.48 4. 10.3

asked by Anonymous on February 7, 2015
13. ## Chemistry

How much volume (in mL) of 0.75 M K2SO4 (aq) and water must be mixed to prepare to 150.0 mL of 0.10 M K2SO4 solution? Thanks!

asked by Mike on April 16, 2012
14. ## Chemistry

The Ka of a monoprotic weak acid is 8.11 x 10 ^ -3. What is the percent ionization of a 0.125M solution of this acid?

asked by Joe on March 24, 2013
15. ## Chemistry

How much Na2CO3 would you weigh to prepare M/20 Na2CO3 solution in 100cm3 volumetric flask?

asked by Sylvia on June 28, 2017
16. ## Chemistry

How many grams of Fe(NO3)2 are present in 555mL of a 0.650 M solution of Fe(NO3)2?? I have no clue what to do??

asked by Ocean on June 21, 2015
17. ## chemistry

Which of the following is the ph of a solution in which concentration of hydrogen ion is greater than hydroxide ion. 0ptions:12,9,7 or 3

asked by kody on July 19, 2014
18. ## chemistry

which solution has the highest concentration of hydroxide ions? a ph=7.93 b ph=12.59 c ph=7.00 d ph=9.82 e ph=3.21 i know the answer is 7 but why is it seven? would it be different if it said hydronium ions?

asked by jessie on December 11, 2010
19. ## Math

What is a “real” zero? 1. A solution to a polynomial. 2. A non-imaginary number. 3.An x-intercept of a polynomial. 4. All of the above. The answer is 4, right?

asked by Jane on February 20, 2015
20. ## Math

1 1/4 cups of sugar is equals to how many liters if 1 cup is equals to 0.24L? with solution please. Thanks!

asked by Yasmine on October 16, 2017
21. ## Chemistry

What is the freezing point of a solution of AlCl3 that contains 55.0 g AlCl3 dissolved in 390 g of water?

asked by Hayden on June 16, 2010
22. ## chemistry

how much NaOH would be needed to dissolve in H2Oto prepare 2.00L of a NaOH solution in which [OH-]=0.95 M?

asked by lindsey on March 29, 2012
23. ## chemistry

Calculate [Cu^2+] in a 0.15 M CuSO4 solution that also 6.5 M in free NH3. Cu^2+ + 4NH3 >>>>>> Cu(NH3)4 kf = 1.1 * 10^11. thx

asked by anonymous on April 21, 2010
24. ## Physics

How could the index of refraction of salt water be used to find the concentration of a salt solution?

asked by Amy on February 15, 2011
25. ## chemistry

If 45 mL of .25 M HCl is required to completely neutralize 25.o mL of NH3, what is the concentration of the NH3 solution?

asked by baker on September 3, 2012
26. ## English

I need a problem with the topic on online learning vs. traditional learning. What is the solution? The justification?

asked by Mary on April 20, 2010
27. ## Chemistry

a solution weighs 44grams. this sample contains 12grams of salt calculate % m/m salt.

asked by Jazmin on April 13, 2010
28. ## Chemistry

If you have 0.150 M HCl solution available, calculate the volume of HCl(aq) necessary for this reaction. _______ml

asked by amber on June 24, 2014
29. ## Chemistry

The Ka of a monoprotic weak acid is 2.04 × 10-3. What is the percent ionization of a 0.181 M solution of this acid?

asked by Mark on October 25, 2011
30. ## Chemistry

The Ka of a monoprotic weak acid is 4.47 × 10-3. What is the percent ionization of a 0.184 M solution of this acid?

asked by Dee on April 11, 2013
31. ## ebusakami girls

number of calcium ions present in 1 mole of calcium chloride solution

asked by jenipher ahono on December 16, 2015
32. ## Chemistry

How many grams of NaCl would be required to make a 24% NaCl solution if 250 ml of water were used

asked by Michelle on May 1, 2011
33. ## AP Chemistry

The pH of a solution of hydrochloric acid is 1.67. What is the molarity of the acid? Answer in units of mol/L

asked by Gabriella on January 21, 2014
34. ## chemistry

what is the volume of 0.)250 MgCl2 should be diluted to 250 mL to obtain a solution with {Cl-} = 0.0135

asked by Aleander Azumah on October 28, 2009
35. ## chemistry

What mass of KNO3 in grams would be required to prepare 0.6 liters of a 1.8 M KNO3 solution?

asked by Megan on November 29, 2011
36. ## chemistry

How many moles of lilthium chloride are dissolved in 3.00 L of a 0.200 M solution of lithium chloride?

asked by Tina on July 8, 2010
37. ## Lone Peak High

How much of a stock (18.5 M) HCl solution would be required to make 100mL of 0.025 M HCl?

asked by Annie on June 7, 2014
38. ## Physics

Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH

asked by Amarachukwu on January 31, 2013
39. ## Chemistry Lab

If 12.50 mL of 0.324 M HCl is diluted to 250.00 mL, what is the concentration of HCl in the final solution?

asked by Thao on May 10, 2011
40. ## Physics

Calculate the pH of a solution obtained by mixing 100cm3 of 0.1M HCl and 100cm3 of 0.2M NaOH

asked by Amarachukwu on January 31, 2013
41. ## science

Calculat the weight of KMnO4 in GMs necessary to prepare 250ml of N/10 KMnO4 solution

asked by pinky on March 30, 2018
42. ## Chemistry

Find the pH of a buffer solution with equimolar concentrations of: HCOOH and NaCOOH (Ka = 3.5 x 10-4 for HCOOH)a

asked by Bill on February 22, 2017
43. ## science

can a solution be made by mixing a solid,liquid,and a gas?Explain. please explain

asked by Anonymous on October 15, 2009
44. ## Chemistry

The Ka for a particular weak acid is 4.0 x 10-9. Calculate the pH of a 0.040 M solution of this acid. whats the relation b/w Ka and pH?

asked by A.A on November 1, 2008
45. ## chemistry

the ph of a 1.00*10^-2 M solution of cyanic acid (HOCN) is 2.77 at 25 C. Calculate Ka and pKa for HOCN from this result.

asked by FB1907 on June 30, 2012
46. ## math

Which pair of equations share a solution? Answer: 5x+2=32 4x+9=5(14-x)-7 -I know the answer but I have absolutely no idea how to get it help please!

asked by Channing on October 28, 2009
47. ## Science

Calculate the PH of and POH of the following solution and comment on them.(a)0.39 moldm3 of H2SO4(b)2.0 moldm3 of NaoH

48. ## Chemistry

A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH.What is the pH after 20.0 mL of the 0.10 M NaOH is added?

asked by Cortney on May 6, 2015
49. ## Chemistry

How many grams of CH3OH must be added to water to prepare 420.0 mL of a solution that is 5.0 M CH3OH?

asked by Camarra on March 10, 2010
50. ## chemistry

if a solution contains 255mL of ethanol and 375 mL ofwater, what is the percent of ethanol in the soution

asked by mike on June 10, 2012
51. ## science

What is the concentration in % by volume of acetic solution 50 ml acetic acid and 400 ml water

asked by Ryuta on June 12, 2013
52. ## chemistry

The pH of a 0.0642 M solution of a monoprotic acid is 3.86. s this a strong acid? the answer is no, can you explain why??

asked by jin on July 4, 2010
53. ## math

On a number line, the coordinate of A is -18 and that of B is 18. C is a point on AB such that AC:CB = 4:5. What is the coordinate of C? with solution pls... tnx...

asked by HELP HELP HELP MNHS on January 30, 2013
54. ## Algebra

What is the side length of a square with an area of 144x²? A.12 B.12x C.±12x D.no solution I think it is C...?

asked by Cassie on February 25, 2013
55. ## Chemistry-pH problem

If a weak acid has a dissociation constant of 6.4 x 10(-6), what is the pH of a solution of this acid in 0.10 molar concentration?

56. ## chemistry

a bottle of 12.o M HCL has only 49.8 ml left in it. What is the molarity of the hcl if the solution is diluted to 350ml.

asked by wendy on October 14, 2011
57. ## Chemistry

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCI solution, what is the concentration of the HCI?

asked by Crystal on May 12, 2013
58. ## Science

Name 3 examples of a solution salt and water citric fruit and water Can you help me come up with a 3rd one?

asked by running.from.myself on March 3, 2012
59. ## chemistry

You are making 40g of a 29% (w/w) sucrose solution. what amount of sucrose and water would be used. each in grams please

asked by terry on February 1, 2017
60. ## Science

Calculate the PH of and POH of the following solution and comment on them.(a)0.39 moldm3 of H2SO4(b)2.0 moldm3 of NaoH

61. ## chemistry

What is the pH of a solution that is .200M in acid and .500 m in the corresponding salt if the weak acid ka= 5.0x10^-7

asked by Rae on September 2, 2010
62. ## chemistry

What mass of NiSO4 is present in 2.00 x 102ml of 6.00% NiSO4(aq)? (The density of the solution is 1.13g/ml.)

asked by g on November 11, 2013
63. ## chemistry

a solution is made that is 1.5X10^-3M in Zn(NO3)2 and 0.130 M in NH3. the Kf for Zn(NH3)4^2+ is 2.0X10^9

asked by Anonymous on March 3, 2013
64. ## science

What is the pH of 64.1mL of a solution which is 0.81M in KlO and 0.33M in HlO? For HlO use ka=2.3x10^-11.

asked by Regan on November 13, 2018
65. ## Chemistry

To 1.0 L of a 0.38 M solution of HClO2 is added 0.18 mol of NaClO. Calculate the [HClO2] at equilibrium.

asked by B on March 25, 2019
66. ## chemistry

A 4.50e-2 M solution of unknown monoprotic weak base has a pH of 10.200 what is the value of kb for the base

asked by Nancy on April 28, 2010
67. ## Chem

4.30 grams of NH4Cl is added to 14.5 grams of water. Calculate the molality of the solution

asked by CHEM on January 20, 2014
68. ## chemistry

If a solution of lead iodide has [I-] = 1.1x10-4 M, what is the lead(II)ion concentration at equilibrium?

asked by paula on March 16, 2015
69. ## OChem

For Extraction using a separatory funnel, what is poured into the funnel first the solution that is to be extracted or the solvent?

asked by Jasmin on June 8, 2011
70. ## Math

Dividing the square root of 63 by what number will give a rational number solution?

asked by Andie Weaver on April 15, 2010
71. ## Chemistry

What is the pH of a solution prepared by mixing 500mL of 2.0M HCN (Ka= 4.9x10^-10) with 500mL of 1.0 M KOH?

asked by George on March 10, 2015
72. ## Chemistry

When you use a spectrophotometer, should you set the wavelength of light to be the same color as that of the solution, or would a different color be more appropriate? Explain.

asked by Arnold on November 11, 2008
73. ## chemistry

A bottle of 80 proof alcohol is 40% ethanol and 60% water. What is the solvent in this solution? water

asked by krystal on February 21, 2012
74. ## math

This is a multiple choice question. What is the solution of the equation 2(x+2)^2-4=28 1)2 only 2)6 only 3)-2 and 6 4)2 and -6 I did (2x+4)(2x+4)-4=28 4x^2+8x+8x+16-4=28 4x^2+16x+12=28 4x^2+16x=16 This is where I get stuck, can you help? thank you

asked by sara on April 22, 2017
75. ## chemistry

How would a chemist make up 100g of 10% aqueous solution of HCl (using 12M HCl)

asked by Dena on September 9, 2012
76. ## Chemistry

How many grams of sucrose will be necessary to prepare 300 ml of a 5% solution of sucrose (342.0 g/mol)

77. ## chemistry

an aqueous solution of ammonia has 0.8% NH3 by weight.calculate the NH3 molarity

asked by anna on March 4, 2011
78. ## Biology Lab

HOw much Nacl (MW= 58.44g) would you need to ass to a solution if you wanted to make 100 ,mL of 4* 10 to the -3 M NaCl?

asked by Amber on February 22, 2012
79. ## Algebra (Factoring)

What's the easiest way to factor this completely? 2x^4-10x^2-72 A step-by-step solution would really help me a lot. Thanks :)

asked by Jean-Claude on June 13, 2014
80. ## Chemistry

The molar solubility of Pb(IO3)2 in a 0.10 M NaIO3 solution is 2.4 10-11 mol/L. What is Ksp for Pb(IO3)2?

asked by Steve on April 28, 2011
81. ## chemistry

How many grams of cadmium must react to displace 13.0 g of copper from a solution of copper nitrate?

asked by tata on October 12, 2010
82. ## Intro to Chemistry

How do you determine the mass of NACL needed to prepare 25.00 ml of a 1.585M NaCl Solution?

asked by Jenny on November 19, 2012
83. ## Math

Give a real world scenario in which you would write an inequality rather than a solution. Please help I can't think of a scenario.

asked by Senpai onii-chan on September 19, 2016
84. ## AP Chem

how many milliliters of 0.10 M HCl must be added to 50.0 mL of 0.40 HCl to give a final solution that has a molarity of 0.25 M?

asked by Allie on August 21, 2012
85. ## chemistry

mL of 0.0100 M NaOH are added to 25.0 mL of 0.0100 M acetic acid. What is the pH of the resulting solution?

asked by yahn on October 21, 2011
86. ## chemistry

How many grams of cadmium must react to displace 13.0 g of copper from a solution of copper nitrate?

asked by tata on October 12, 2010
87. ## chemistry

If 10.0 mL of 0.250 mol/L NaOH(aq) is added to 30.0 mL of 0.17 mol/L HOCN(aq), what is the pH of the resulting solution?

asked by Tim's Titration Lab on April 5, 2008
88. ## chemistry

Determine the volume (in mL) of a 0.184 M CaCl2 solution that would be required to obtain 73.4 g of CaCl2.

asked by jessica on April 23, 2010
89. ## Science

Which of the following is the pH when the concentrations of hydrogen ions and hydroxide ions in an aqueous solution are equal? A. 14 B. 7 C. 1 D. 0 I think 1

asked by AMGCSTRNBSN on March 26, 2016
90. ## chemistry

8 mL of 0.0100 M HCl are added to 22 mL of 0.0100 M acetic acid. What is the pH of the resulting solution?

asked by annie on October 21, 2011
91. ## Life Orientation

Recomment two ways in which a person should approach conflict to ensure conflict solution

asked by Happy on February 15, 2017

How many liters of .0020 M iodine solution can be made from .050 moles of iodine (I2)?

asked by Kellie on November 23, 2011
93. ## chemistry

Balance the equation in aqueous acidic solution: IO-(aq) + I-(aq) → I2(s) i know you have to add either water or H+ but i cant seem to balance it out thanks for the help!!

asked by Balancing Equations on November 12, 2011
94. ## science

How many grams of CuSO4 .5H2O are needed to prepare 50 ml of 0.30M CuSO4 solution

asked by kesiha on March 7, 2010
95. ## chemistry

two solutions are mixed: 100.0 mL HCl(aq) with p 2.20 and 100.0 mL of NaOH}(aq) with pH} 11.20. What is the pH} of the resulting solution?

asked by anonymous on April 11, 2010
96. ## Math

Find the specific solution for the following differential equations: a) (dy/dx)^2 - x^4 = 0 given the initial value y(1) = 0 b) dy/dx = ysinx given the initial value y(pi) = 1

asked by Alice on November 9, 2008
97. ## chemistry

describe step by step, how will you prepare 10 mL of 0.020 M HCL from the 0.050 M solution?

asked by cristina on October 7, 2012
98. ## Gen cmehistry

Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 x 10-3 M in hydronium ion.

asked by asasas on April 21, 2010
99. ## chemistry121

What mass of silver chloride can be produced from 1.25 L of a 0.264 M solution of silver nitrate?

asked by graciela on October 19, 2011
100. ## chemistry121

What mass of silver chloride can be produced from 1.25 L of a 0.264 M solution of silver nitrate?

asked by graciela on October 19, 2011