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

92,096 questions, page 423
1. chemistry

How many ML of H2SO4 (20m) are needed to make 500ml of 5M solution?

asked by ad on September 21, 2010
2. Chemistry

How many moles of HNO3 are present in 35.0 mL of a 2.60 M solution of nitric acid?

asked by Veronica on October 7, 2010
3. calculus

find the general solution to the differential equation. dy/dx=secxtanx-e^x

asked by Anonymous on February 25, 2011
4. math,correction

Graph each of the following equations by first solving for y. 2x – 3y = 12 so it would be: y = 2/3x – 4 and the solutions points would be: So (-3,-6) is a solution

asked by jasmine20 on January 14, 2007
5. precalculus

I have the problem 2e^x = squareroot(10e^x) +3. the solution must be in exact form only.

asked by Sara on January 13, 2012
6. Chemistry

A 0.10M solution of a certain monoprotic weak acid has a pH of 2.44. Calculate Ka.

asked by Jackson on March 1, 2016
7. chemistry

how much ml of concentrated hci required to make 0.5N hcl solution? /

asked by Ashwin on March 24, 2015
8. Chemistry

Determine the total grams of Potassium Iodate solution

asked by Anonymous on October 1, 2015
9. chemistry

give me twenty examples of suspension and colloidal solution

asked by narender on July 5, 2014
10. chemistry

Which must be a mixture of substances? a- Solid b- Liquid c- Gas d- Solution

asked by John on March 5, 2008
11. Algebra

which ordered pair in the form (x, y) is a solution of this equation? (x+6)y=9 Possible Answers: A. (12,2) B. (3,1) C. (2,1) D. (4,1)

asked by Niki on January 22, 2016
12. Chemistry

What effect does diluting the sodium hydroxide have on the basicity of the solution?

asked by Dick Rogers on December 15, 2007
13. Chemistry HELP URGENT PLEASE!!!

what current (in amperes) is required to plate out 2.85 g of Cr from a Cr^3+ solution in a period of 2.50 hr?

asked by Maho on March 17, 2014
14. history

Evaluate the effectiveness of nixon's solution. was it successful? how do you determine this?

asked by aria on May 12, 2016
15. MATH

A 0.26 M solution of a weak acid HA is 0.35 % ionized. What are the H+ , A- , and HA concentrations at equilibrium? What is Ka?

asked by Ash on January 28, 2017
16. Chemistry

What would be the molality of a solution made up of 75cm^3 of water and 0.21 g of NaCl?

asked by Alice on February 19, 2009
17. ap chemistr

The ionization constant of HA is 1×10−6. What must be the ratio of [A−] to [HA] for the preparation of a buffer solution with a pH of 5.74?

asked by gabriella on February 4, 2014
18. Chemistry

How much more acetic acid (pKa = 4.76) than acetate should be in solution to maintain a pH of 4.00?

asked by Jematormal91 on March 29, 2012
19. physics

in electrolysis how is conductivity affected by the molecular mass of the solution

asked by physics123 on February 20, 2012
20. chemistry

how would you prepare 1L of a .5M solution of each of the following? Sodium carbonate from the pure solid

asked by kelly on August 25, 2010
21. chemistry

What is the concentration of a solution containing 25g of NaCl in a 250mL sample?"

asked by Samantha on June 6, 2011
22. math

A=29 degrees, a= 5, b=13, How many solutions are there for triangle ABC and whats the solution(s)

asked by lindsey on May 3, 2011
23. physical science

list two safety procedures to create a supersaturated solution

asked by matthew on May 3, 2011
24. CHM

Calculate the solubility of Cu(oh)2 in grams per liters of solution if Ksp for Cu(OH)2 IS 4.8X 10^-20

asked by ami on June 27, 2010
25. Chemistry

What is the pH when 3.46 mL of 2.37 M KOH is added to 26.9 mL of a 1.78 M solution of formic acid (HCOOH)?

asked by sarah on February 24, 2011
26. Chemistry

How to calculate the density and viscosity of a 10 % by wt salicyclic cid solution.

asked by arp on February 15, 2010
27. CHEMISTRY

CONC.OF NO2^-AND H3O^+IN A SOLUTION IN WHICH 4.5% OH HNO2 WAS IONIZED

asked by JOSEPH on October 20, 2017
28. chemestry

if you dissolve 350 g of K(2)CrO(4)in 2.4 kg of water, what is the molality of the solution?

asked by crystal on April 25, 2013
29. Chemestry

Find the molarity of a solution containing 0.75 mol of NaCl with a volume of 1.5 L.

asked by Becky on November 23, 2012
30. science

Explain why the temperature of water might increase when a solution forms.

asked by Morgan on October 6, 2012
31. chemistry

What is the boiling point of an aqueous solution that freezes at -6.7 degress C. Please help.

asked by swtnblk on November 5, 2011
32. chemistry

How much water must be added to 6.0 mL of a 0.05 M stock solution to dilute it to 0.020 M?

asked by Anonymous on May 21, 2011
33. Chemisty

calculate pH of 50.0 mL of a .100 M solution of the weak monoprotic acid HX

asked by Emily on March 29, 2010
34. Chemistry

How many grams of perchloric acid are dissolved into 3.86 L of water, if the pH of the solution is 4.03.

asked by Jose on May 11, 2016
35. Some basic concept of chemistry

0.5M aluminum sulphate aques solution normality calculation

asked by Chhaya on January 25, 2017
36. chemistry

calculate the poh of 1 dm^3 of naoh solution containing 4 g of sodium hydroxide

asked by Anonymous on May 5, 2016
37. chemistry

why do you use Na2Co3 extract solution tor the analysis of anions

asked by saiful on July 25, 2011
38. chemistry

A solution made from 19.0 g of NaBr and 500 mL of water has what molarity?

asked by Cindi on May 4, 2011
39. algebra

Find solution to equation X^2+x+ãx^2+x-2 =0 Note; square root is x^2+x-2

asked by Jessica on July 21, 2009
40. Chemistry II

Calculate the freezing point of a 0.75 m solution of Al2(CO3)3.

asked by Chase on September 16, 2009
41. chemestry

Calculate [OH^ - ] for strong base solution: 14.0 mL of 1.20×10−2 M Ca(OH)_2 diluted to 430.0 mL.

asked by chris on February 22, 2012
42. chemistry

What volume of 0.5M H2SO4 will exactly neutralise 20cm3 of 0.1MNaOH solution?

asked by aniekan on July 27, 2015
43. Chemistry

A solution is 25% by mass calcium nitrate and has a density of 1.21 g/mL what is the molarity?

asked by Adrian on May 12, 2016
44. science

Which one of the solution have high boiling point 1m H3PO4 or 1m CaCl2 ?

asked by SERHED on January 25, 2016
45. Chemistry

What is the molality of ammonium ions in a 1.75 m solution of (NH4)3PO4?

asked by haley on September 16, 2009
46. Algebra2

Write three trigonometric equations each with the complete solution pi+2pin

asked by steve on May 10, 2017
47. Chemistry

What is the maximum [Ba^2+] that can be maintained in 1.100 L of a 030 M solution of Na2SO4?

asked by Jeremy on November 30, 2010
48. Chemistry

How many grams of solute are in 0.504 L of a 0.350 M K2CO3 solution?

asked by msid on March 4, 2016
49. chemistry

How would you prepare a supersaturated solution of CuSo4 in 100ml of water

asked by Jen on November 24, 2012
50. Chemistry

There are 200 mmoles NaOH/400ml. What is the molarity of the solution?

asked by Jessi on April 21, 2009
51. Chemistry

How many grams of NaCL are required to make 250ml of a 0.4M solution?

asked by Jessi on April 21, 2009
52. Chemistry

need help to balance half reaction in basic solution IO3 to I2

asked by Shana on July 27, 2013
53. math

tell whether the point (9,3) is a solution of the inequality 4x-5y

asked by maya on April 22, 2009
54. Chemistry

when 5.00 g of CaCl2 dissolves in 50.0g of water, what is the boiling point of the solution

asked by Leah on April 17, 2011
55. chemistry

What would be pH of a 0.01 M solution of a very expensive weak base, unobtainamine, whose pKb is 3.8? 1. 2.9 2. 14 3. 2 4. 7 5. 11.1

asked by Anonymous on February 7, 2015
56. Chemistry

How many g of CaCl2 are required to prepare 0.250 L of a 0.200 M solution?

asked by Aaron on December 13, 2015
57. College Chem II

Determine the [H3O+] of a 0.160M solution of benzoic acid.

asked by Katie on March 7, 2010
58. Maths

How can it be possible for a set of inhomogeneous simultaneous equations to have no unique solution?

asked by Alice on April 28, 2009
59. Chemistry

what is the pOH of a solution that has a OH- cincentration equal to 1,36 multiple by 10^-10M?

asked by prudence on April 6, 2018
60. Math

Write three fractions that can be written as percents between 50% and 75%. Justify your solution Can you please help me????

asked by Jenna on September 28, 2016
61. science

what is the solute and solvent in a solution made from 15 mL of oxygen and 5 mL of helium?

asked by jan on November 4, 2010
62. chemistry

how many ml of 0.15 NaOH solution are required to neutralize 35.00 ml of 0.22 moles of HCL

asked by mc on April 14, 2010
63. Math

write three fractions that can be written as percents between 50% and 75%. Justify your solution.

asked by Jen on November 13, 2014
64. science

What is the [Pb+2] in a saturated solution of Pb(OH)2 for each of the following initial pH values? Ksp Pb(OH)2 = 2.8x10-16 a. pH = 13.00 b. pH = 9.20

asked by N/A on January 31, 2011
65. math

find the linear differential equation that has y=5-x+2e^xsin3x as a particular solution

asked by toby on July 21, 2015
66. math

state the value of the discriminant and the discribe the nature of the solution 20x^2-8x-17=0

asked by marie on August 29, 2010
67. Chemistry

Concentrated nitric acid is 70% HNO3 and 14.7 M. What is the density of the solution?

asked by Julia on May 12, 2016
68. Algebra

PLEASE HELP ME!!! 1. Which of the following is an example of an open equation? A. -2b = 6 B. 4a - 5 = 12 C. 5Y = y +8 D. Z-15= -12 2. Which of the following equations has 3 as the solution? A. -2b=6 B. 4a-5=12 C.5y=y+8 D. Z-15=-12 my answers: 1. 8+0=8 2.

asked by Damien666158 on October 15, 2018
69. science

in a solution can amounts of different components vary? like in a heterogenous mixture

asked by bella on October 6, 2007
70. Algebra 2

Find the solution of the exponential form in terms of logarithms 2^(2x+13) = 3^(x-45)

asked by Andrew on April 30, 2010
71. CHEMISTRY.

Calculate the ph of a solution containing 0.15M HF (ka= 7.1x10^-4) and 0.26M NaF.

asked by Siobhan.R on May 10, 2017
72. chemistry

What is [H+] concentration in a 4M aq solution of acetic acid (Ka= 1.8 E-5)? what formula do you use to get the answer?

asked by Anonymous on July 3, 2011
73. chemistry

How would you make 250 ml of a .51M calcium hydroxide solution?

asked by Sarah on March 30, 2011
74. algebra 1a

can someone help in solving this and use set builder notations to describe the solution Please 4(8-2x)+2x

asked by robbie on January 30, 2011
75. Chemistry

What is the molality of an aqueous solution that is 10.0% ethanol, C2H5OH, by mass?

asked by Marcus on February 10, 2013
76. Math

1÷5 (45y+20)+3÷4 (12y=24)=19 Find solution set (9y=14)+(9y=18)=19 18y = 33÷8

asked by Sue on July 17, 2015
77. chemistry

0.947 moles of NaC2H3O2 dissolved in 100 mL solution

asked by chem on April 16, 2015
78. Math

Determine the quadratic equation whose solutions are: 3 and -2 Solution(with workings):

asked by Ghiffari on October 23, 2011
79. Chemistry

How many liters of 0.85 M HCl solution would react completely with 3.5 moles Ca(OH)2?

asked by Kevin on June 20, 2016
80. Chemistry

How would we make 500mL of a 1.5 percent w/v solution of KCl in water?

asked by Stacy on October 12, 2012
81. chemistry

Could you produce a cell that contains a 1.0M solution of Fe2+ and Fe3+ ions?

asked by Wina on March 5, 2011
82. Chemistry

How many moles of methanol are dissolved in 1.5 L of water to make a 2.0 m solution?

asked by Bigfoot on May 18, 2012
83. chemistry

what is the solubility of X in mole/dm3 if 25cm of its saturated solution contains 4.0g of X.

asked by emma 45 on March 14, 2012
84. chemistry

If you have 200. mL of a 0.50 M solution of KOH and you wish to dilute it to 0.30 M, how many mL of water should you add?

asked by Anonymous on April 7, 2011
85. Jane

I am confused what would be a real-life solution using polynomial division.

asked by Math on January 21, 2010
86. chemistry

what is the concentration of a 250 ml solution that contains 44 grams of magnesium fluoride

asked by Emily on August 21, 2013
87. chemistry

a solution is made by mixing 14.5g of NaOH and 72.0 mL of 0.250 M HNO3

asked by Anonymous on March 4, 2011
88. chemistry

how will u prepare 500g of aqueos solution which is 10% NaOH by mass?(%W/W)

asked by yui on March 4, 2011
89. Calculus

Find the solution subject to the initial conditions. dP/dt = -2P P(0)=1 dP/-2P = dt then do i take the antiderivative? what would i do next??

asked by Daniel on December 4, 2008
90. Math urgent

explain how to compute the xy term of the product (3x-4y)^2? if possible with solution please.... its urgent

asked by Ayushma on September 7, 2008
91. pharmacology

How many grams of dextrose are in 50ml normal saline solution

asked by carol on March 9, 2017
92. chemistry

what mass of water is necessary to prepare 150.0g of 1.30% saline solution

asked by Anonymous on December 12, 2014
93. Chmistry

how to calculate ph if given contain 0.63g og hno3 pet 100 ml solution

asked by Fofo on February 6, 2016
94. Chemistry

What is the molarity of a solution of H3PO4 if 11.1 mL is neutralized by 33.2 mL of 0.161 M NaOH?

asked by taytay on April 20, 2014
95. chemistry

You have 37.0 mL of a 3.00 M stock solution that must be diluted to 0.500 M. How much water should you add?

asked by Brianna on January 21, 2013
96. Science

How many grams of NaOH will be needed to prepare 250ml of 0.1M solution:-

asked by Md Shams Rizvi on March 10, 2017
97. chemistry

How would you determine the polarity of the cell after each addition of Fe3+ solution

asked by ronika kumar on September 23, 2015
98. school math 3rd grader

how to find solution to subtraction problem without doing any calculation. explain?

asked by tom on November 18, 2015
99. Chemistry

A 0.035 M solution of a weak base has a pH of 10.88. What is the Kb for the acid? Where Di I even begun**???

asked by L.Bianchessi on March 5, 2012
100. chemistry

What is the solubility of CaF2 in a buffer solution containing .30 M HCHO2 and .20 M NaCHO2?

asked by Kelley on April 4, 2010