# why does the equation x^2=-9 has no real solution why does the equation x^2 = 9 has two solutions

56,329 questions, page 448
1. ## Chemistry 12

Calculate the pH of the solution that results when 27.38mL of 0.15M H2SO4(aq) is mixed with 18.50mL of 0.19M Ca(OH)2 (aq)

asked by Anonymous on October 17, 2011
2. ## chemistry

40 mL of 0.150 M ammonium hydroxide is added to 20 mL of 0.3 M perchloric acid. What is the final pH of the resulting solution?

asked by Anonymous on May 17, 2017
3. ## chemistry

30.0 mL 0.200 M lithium hydroxide is added to 50 mL of 0.1 M nitrous acid. What is the final pH of the resulting solution?

asked by YT on May 17, 2017
4. ## chemistry

Find the amount of solute deposit when 200 cm 3 of the solution is cooled from 55oc to40oc.

asked by Stephen on December 28, 2011
5. ## math

What is the area of the region bounded by the x-axis and the lines x+y=24 and 3x-2y=12? Please show full solution and explanation

asked by K on December 19, 2017
6. ## Science - chemistry

The osmotic pressure of a solution of MgCl2 is 5.43 atm at 25 oC. How much of the salt is dissolved in 250.0 ml of water?

asked by Teagan on June 8, 2014
7. ## alg 2

2 questions: 1. Find "a" if (-3,7) is a solution of 2x+ay=26 2. solve system using substitution, linear combination, and graphing: 3x-2y=3 5x+4y=16

asked by Mariya on September 5, 2007
8. ## Algebra 2

2 questions: 1. Find "a" if (=3,7) is a solution of 2x+ay=26 2. solve system using substitution, linear combination, and graphing: 3x-2y=3 5x+4y=16

asked by Mariya on September 5, 2007
9. ## Chemistry

How many grams of magnesium sulfate would you need to make 0.500 L of a 10.0% M/V solution in water? Please show work.

asked by Margaret on February 18, 2013
10. ## Science

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

asked by Shanton on January 2, 2018
11. ## 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
12. ## Math

After deducting10% from sum and then 20% from the remainder₹3600 are left.Find original amount.Solution

asked by Prateek on June 8, 2017
13. ## Organic Chemistry

calculate how much of 10% aqueous sodium carbonate would be required to neutralize the solution (This is during the preparation of benzocaine)

asked by Emma on April 3, 2012
14. ## Chemistry

find the concentration of h3o in a .86mol/l solution of the weak acid H2O2 (kA=2.4x10-12)

asked by Buck on May 31, 2016
15. ## Chemistry, Solutions

Two or more combined substances that do not react form a _________. solution mixture substance compound

asked by Jason on September 16, 2010
16. ## Chemistry

What is the pH of a 0.40 mol L^-1 H2Se solution that has the stepwise dissociation constants Ka1 = 1.3 × 10^-4 and Ka2 = 1.0 x 10^-11 ? Thanks in advance

asked by Elaina on June 21, 2015
17. ## Science

How many kilos of ammonia (N1H2)are contained in 600L of a solution that is8% NC13 by volume

asked by Carrisse on July 16, 2013
18. ## math

Show you solution. List the terms that complete a possible pattern in each of the following: a)38,33,28,23,18,_,_,_ b)640,320,160,80,_,_,_ c)7,8,15,23,38,_,_,_

asked by Anonymous on September 24, 2010
19. ## Chem 132

If the density of a 40.0 mass % solution of ethylene glycol in water is 1.0514g/mL at 20 celcius what is the molarity

asked by RB on September 24, 2014

Which 0.10M solution has the lowest pH? NaCl, KCN, LiF, RbClO, all have the same pH. I think that the answer is that they all have the same pH. Would you agree? Thank you!

asked by Hannah on April 1, 2012
21. ## chem

The concentration of a benzene solution prepared by mixing 12.0 g C6H6 with 38.0 g CCl4 is__________ molal.

asked by jessie on September 15, 2010
22. ## algebra

Find the radius and the center of the circular section of the sphere |r| = 17 cut off by the plane rÂ·(i+2j+2k) = 24. Solution

asked by shamma on October 4, 2017
23. ## chemistry

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 27, 2009
24. ## Chemistry

If a solution is made by mixing 50.0 moles of KOH to 3.4 kilograms of water, what is the solutions molality?

asked by Samuel on February 26, 2011
25. ## Chemistry

If a solution is made by mixing 50.0 moles of KOH to 3.4 kilograms of water, what is the solutions molality?

asked by Samuel on February 26, 2011
26. ## Chemistry

If a solution is made by mixing 50.0 moles of KOH to 3.4 kilograms of water, what is the solutions molality?

asked by Samuel on February 26, 2011
27. ## General Chemistry I

Determine the mass of Co(NO3)2 X 6H2O to prepare 250mL of a .50M stock solution.

asked by Toni on February 28, 2011
28. ## Math

I need to graph solution sets for linear inequalities. How do I do this? I've done these kind already send me an example of one and i'll explain its probably similar to the ones i did.

asked by Sam on January 10, 2007
29. ## 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
30. ## Chemistry

What volume of a 0.578 M potassium hydroxide solution is needed to exactly neutralize 3.26 grams of KHP ?

asked by Anonymous on October 21, 2011
31. ## Chemistry

What volume of a 0.578 M potassium hydroxide solution is needed to exactly neutralize 3.26 grams of KHP ?

asked by Anonymous on October 21, 2011
32. ## Chemistry

How many total mL of 1 M NaOH can you add to the solution in problem 1 and still have a good buffer (that is, within 1 pH unit of the pka)?

asked by Irving on September 5, 2017
33. ## 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
34. ## algebra

solve using the subsitution method 4x+4y=36 4x+4y=12 If the system has no solution or an infinite number of solutions, please help me understand it.

asked by mema on June 9, 2011
35. ## college math

Solve. write the solution set using interval notation 9-(7x-9)is greater than or equal to sign -8(x+1)-8

asked by Anonymous on September 19, 2010
36. ## biochemistry

How do you calculate the PH of a buffer solution prepared by mixing 75 mL of 1.0 M lactic acid and 25 mL of 1.0 M sodium lactate?

asked by nicki on September 18, 2010
37. ## math

If 4 7 47 of 35 35 is divided by 2 9 29 of 21 21 , what is the quotient? Write the solution as a mixed number or a fraction in lowest terms.

asked by Anonymous on September 23, 2017
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

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
40. ## math

Determine the solution of the following systems of linear equations using elimination. Briefly explain your work. 3x +2y = 19 2x – 3y = -6

asked by jordan on December 22, 2015
41. ## Bio

How much NaC3H5O3 (in grams) is needed to create a 1000 ml volume of Ringer’s lactate solution?

asked by Joe on September 6, 2011
42. ## chemistry

Determine the mole fraction of each substance in a solution containing 36.0g H2O and 46g glycerin, C3H5(OH)3

asked by chantal on April 15, 2014
43. ## Chemistry

The mass of lead bromide that is dissolved in 250 mL of a saturated solution is____ grams.

asked by Kat on May 27, 2016

a solution of 30% ethanol by weight has a density of 0.96g/ml at 25 degree celsius. find the molarity.

asked by pat.. on September 30, 2010
45. ## 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
46. ## chemistry

What volume of water should be added to 50 ml of HNO3 having specific gravity 1.5g ml-1 and 63.0%by weight to have one molar solution

47. ## Chemistry

500 mL of water is added to 25 mL of 6.0 M hydrochloric acid. What is the final concentration of this solution in mol/L?

asked by Ashley on October 5, 2009
48. ## english

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

49. ## Chemistry

Calculate the weight of anhydrous Na2CO3 necessary to prepare M/20 solution in 100cm3 volumetric flask

asked by Sylvia on June 28, 2017
50. ## 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
51. ## chemistry

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

asked by kate on May 29, 2009
52. ## Organic Chemistry

2. Why doesn’t the neutral organic compound (Flourene) dissolve in 1.5 M sodium hydroxide solution?

asked by Dora on November 4, 2008
53. ## 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
54. ## chemistry

What would be the concentration of a solution made by dissolving 0.5 moles of KCl in 750ml liters of water?

asked by Juliettte on March 5, 2011
55. ## 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
56. ## Chemistry

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

asked by Kelsey on October 30, 2017
57. ## chemistry

The Henry's law constant for CO2 is 3.1 x 10-2 mol/L-atm at 25°C. What pressure would be necessary in order to have a .25 M solution?

asked by S on February 5, 2015
58. ## 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
59. ## chemistry

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

asked by bob on May 20, 2009
60. ## 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
61. ## CHEMISTRY

GIVEN A 30G OF ALCL3 DISSOLVED IN 250G OF WATER TO CME UP WITH 400ML SOLUTION WHAT IS THE NORMALITY ?

asked by Savannah on July 31, 2017
62. ## Chemistry (again)

What mass of NaOH is required to precipitate all the Fe2+ ions from 52.0 mL of 0.200 M Fe(NO3)2 solution?

asked by Alex on September 28, 2010
63. ## Chemistry

An aqueous solution is 1.33 molality in method determine the amount fraction of methenal and water

asked by Aman on August 10, 2013
64. ## algebra

use method of substitution to solve the system of linear equations. 2x-y=3 9x-4y=14 is the solution an ordered pair(,)

asked by scott on March 30, 2012
65. ## chemistry

How many moles of water form when 40.0 ml of .800 M HNO3 solution is completely neutralized by NaOH?

asked by mary on September 12, 2010
66. ## chemistry

Determine the osmotic pressure (in psi) , at 75.0o F, of an aqueous solution that is 2.60 % sodium sulfate by mass

asked by G-Unit 32 on February 9, 2010
67. ## 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
68. ## algebra

Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this 3^(2x + 1) = 243

asked by allice on September 11, 2010
69. ## algebra

Solve. Where appropriate, include approximations to the nearest thousandth. If no solution exists, state this. log[5] (5x - 1) = 1

asked by mar on September 10, 2010
70. ## 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
71. ## 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
72. ## Biochemistry

Calculate [H+] or [OH-]as required for each of the following solutions at 25degrees and state whether the solution is neutral, acidic or basic

asked by Mervis on June 10, 2017
73. ## Chem

What is the concentration of a solution made by diluting 85 mL of 6.0 mg/L free chlorine to a final volume of 750 mL?

asked by Z on September 19, 2015
74. ## AP Chemistry

Consider 67.0 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.500. What volume of water must be added to make the pH = 5.000?

asked by Bill on February 7, 2012
75. ## Chemistry

1. Outline a procedure to prepare an ammonia/ammonium buffer solution. I'm confused how to start it off.

asked by Emily on May 25, 2018
76. ## 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
77. ## chemistry

How many grams of sucrose would you dissolve in water for a total volume of 500mL to make a 5% solution?

asked by jami on January 20, 2010
78. ## Chemistry

Describe how would you prepare .005M solution of IO3^-1 starting with potassium iodate KIO3

asked by Gweedo on June 9, 2009
79. ## 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
80. ## chemistry

how to Calculate the molarity of a solution if sulphuric acid contains 13%H2SO4 by mass and density is 1.02 gm per cm3.

asked by hari on May 4, 2012
81. ## Linear Equations

Solve using the elimination method. If the system has no solution or an infinite number of solutions, state this. -2x - 8y = 22 -6x - y = 20

asked by Kelli on May 23, 2011
82. ## Algebra

Solve using the substitution method. If the system has no solution or an infinite number of solutions, state this. -x + 6y = 54 3x + y = 9

asked by Wayne on May 23, 2011
83. ## chemistry

how to Calculate the molarity of a solution if sulphuric acid contains 13%H2SO4 by mass and density is 1.02 gm per cm3.

asked by hari on May 4, 2012
84. ## chemistry

Neoton - Raphsune method in excel that sulibility Ba(Io3) in Ba(No3)2 solution, .02M

85. ## math

If the solution to the linear programming problem exists, then it has to be at a corner point.it is true or false?

asked by sateko on April 18, 2011
86. ## Easy Chemistry

How long (in minutes) must a 5.40 A current be passed through an aqueous solution of zinc nitrate to deposit 87.5 g Zn?

asked by Morgan on October 20, 2014
87. ## math

solve the polynomial ineqaality. express the solution set in interval notation. x^3+x^2+64x+64>0

asked by Kelli on January 4, 2013
88. ## C

number of moles of NaOH required to titrate 38.05mL of a 1.500 M H3PO4 solution

asked by Nick on October 11, 2011
89. ## Chemistry

number of moles of NaOH required to titrate 38.05mL of a 1.500 M H3PO4 solution

asked by Tyler on October 12, 2011
90. ## 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
91. ## math

22_

asked by janay1978 on June 9, 2009
92. ## Math

solve using the multiplication principle. don't forget to perform a check. 12x=-96 the solution is x=

asked by Tom on September 27, 2009
93. ## chemistry

Calculate how much energy will be released when 11.11g of calcium chloride are dissolved in 100ml of solution

asked by Mandy on May 2, 2009

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
95. ## 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
96. ## Chemistry

Determine the hydronium ion concentration in a solution that is 0.00039 M HCl. Answer in units of M.

asked by Kiara on May 12, 2018
97. ## Chemistry 2

Calcualte PH and POh of an aqueous solution that is 0.050 M in HCL and 0.085 M in HBr at 25 degrees C

asked by Jason on February 21, 2014
98. ## science

What is the percent concentration of 0.4 M K2SO4 solution? Atomic mass: K-39g,S-32g, O-16g

asked by mustafa on November 18, 2015
99. ## 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
100. ## Math

Question: Describe and fix the error in the following solution 9.50 - 7.18 = 2.48 Answer: I really don't see the mistake in this problem.

asked by Cameron on November 18, 2015