# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 168
1. ## Chemistry

What is the molarity of a solution of sucrose that has a density of 1.24g/ml and a molecular weight of 342.3g/mol

asked by confuzzled on September 18, 2011
2. ## math

Solve each linear system. Verify each solution by substituting the coordinates of your solutino into both equations. a) y = -x and y = x - 6 b) x - y = 8 and x + 2y = 2

asked by MATH on November 13, 2017
3. ## 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
4. ## Algerbra

Find the missing coordinate to complete the​ ordered-pair solution to the given linear equation y+4x=3 (-1,) (5,)

asked by lesca on January 10, 2016

Calculate the pH of an aqueous solution of 0.15 M potassium carbonate. I know that pH = -log(H30+) but I am not sure how to start this problem.

asked by Hannah on April 14, 2012
6. ## Chem

How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?

asked by George on March 19, 2013
7. ## 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
8. ## 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
9. ## 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
10. ## Chemistry

Calculate the mass of Copper(II) Sulfate CuSo4 needed to make 3.00Lof 3.0 M solution?

asked by Angie on May 13, 2015
11. ## 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
12. ## 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
13. ## chemistry

calculate the mass percent of a solution that is prepared by adding 62.3g of NaOH to 343g of H2O?

asked by lima on October 16, 2013
14. ## chem

calculate the molality of a solution that has 1.02kg sucrose (C12H22O11), dissolved in 554g water.

asked by julia on October 27, 2010
15. ## math help

2x^4-3x^2-7x+1=0 Estimate what the real solution will be using Newton's method. Answers must be 4 decimal places. Let the first guess be x=1.75

asked by Rachel on January 19, 2016
16. ## Chemistry

I have 500 mL of a 6.0 M solution that I want diluted down to 2 M. How many mL of water should I add to the solutiion. " FOR EVERY PROBLEM YOU MUST DRAW A PICUTRE"

asked by Emma on February 20, 2014
17. ## 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
18. ## Math Help

2x^4-3x^2-7x+1=0 Estimate what the real solution will be using Newton's method. Answers must be 4 decimal places. Let the first guess be x=1.75

asked by Rachel on January 19, 2016
19. ## CHM 152

How many gram of Fe+3 are required to make 1.0 L of an aqueous solution of 10 ppm Fe+3? Assume density of water is 1.00 g/mL.

asked by Car on June 8, 2010
20. ## 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

If you add 4 grams of KCl to 10g of water at 28 C, would the solution be saturated, unsaturated or supersaturated?

asked by Anonymous on February 14, 2011
22. ## science

at what temperature will 50g of nh4br produce a saturated solution when dissolved in 100 g of water

asked by k on January 17, 2019
23. ## Chemistry 104

Nitric acid, HNO3, is available commercially at a concentration of 16 M. What volume would you use to prepare 770 mL of a 0.19 M solution?

asked by Brenna on November 11, 2010
24. ## Chemistry

Calculate the percent ionization of 0.140 M lactic acid in a solution containing 8.5×10−3 M sodium lactate.

asked by John on April 27, 2013
25. ## 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
26. ## chemistry

when zinc graurles are dipped in copper sulphate solution write balance equation?

asked by swati on May 10, 2016
27. ## Chemistry

what is the osmotic pressure produced by a 1.20M glucose (C6H12O6) solution at 25 degree celsuis?

asked by Elsie on May 11, 2016
28. ## 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
29. ## chemistry

how much sodium chloride and how much water would you need to prepared a 5.00kg of an aqueous solution that is 10.0% NaCl by mass?

asked by roshni on January 15, 2011
30. ## 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
31. ## 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
32. ## Math

Find all real number X Which satisfy the inequality 1/3(X+3)-1>1/5(X+6) Pls I need answer with solution step

asked by Simon on March 29, 2018
33. ## 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
34. ## 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

35. ## MATH- Algebra 2

x^2-6>-5x 6x^2-5x+1

asked by Blair on February 17, 2013
36. ## 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
37. ## Chemistry

What is the pH of a buffer solution that is 0.15 M propionic acid and 0.20M sodium propionate? How do I start this problem

asked by LT on April 1, 2008
38. ## Science

Solution preparation: 500ml's of .2M Sodium Cacodylate Buffer with a pH of 7.4 I don't even know where to start, could someone please tell me how to do this problem.

asked by Jessica on February 24, 2013
39. ## physical sciences(chemistry)

Explain why solution turns blue by referring to the relative strength of oxidising agent?

asked by Xalati on July 6, 2015

Explain the type of solution formed when steam from boiling water evaporates into the air

asked by Anonymous on November 10, 2010
41. ## Chemistry

Calculate the H3O concentration if 100.0 ml of the .10M HNO3 solution is diluted to 1.0L with water?

asked by Kim on April 25, 2013
42. ## chemistry

When a good indicator has been chosen, the pH at which the solution changes color is very close to the__________ point of the titration

asked by Mia on April 4, 2008
43. ## AP Chemistry

How long, in seconds, would it take to deposit 10.5 g of copper onto an electrode from a solution of Cu2+ if a current of 2.00 A was applied?

asked by Jesse on April 13, 2018
44. ## 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

How many kg of pure salt must be added to 8 kg of a 30% solution to obtain a 35% soltution? Round to the nearest tenth.

asked by natalie on November 12, 2009
46. ## Chemistry

Explain how you would prepare 100.0 mL of 0.500 M NaCl solution. Include the appropriate glassware and calculations.

asked by Dee on February 25, 2013
47. ## chemistry

What is the concentration, mass/vol percent (m/v) of a solution prepared from 50.gNaCl and 2.5L? Do I divide 50.g NaCl/2.5L?? = 20% Thank you!

asked by Connie on October 14, 2011
48. ## trig

SOlve over (2,pie) and find the general solution in radians. 2sin3x = square root of 2

asked by Leigh on March 12, 2012
49. ## Chemistry

What mass of NaCl is needed to precipitate all the silver ions from 20.0 mL of 0.100 M AgNO3 solution?

asked by Joe on October 13, 2011
50. ## Chemistry

When 5.4 g of NaCl and 3.6 g of AgNO3 are dissolved in water and mixed, what ions remain in the solution and how many moles of each will be there?

asked by Valeria on October 23, 2014
51. ## 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
52. ## 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
53. ## 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
54. ## math

solve inequality. write the solution set in interval notation 7x+6 greater than or equal to -(x-6)

asked by jessica on January 17, 2009
55. ## chemistry

Using a value of Ksp = 1.8 x 10-2 for the reaction PbCl2(s) = Pb+2(aq) + 2Cl-(aq). If a solution has a current value of Keq of 1.2 x 10-2, which statement is true?

asked by Beth on June 21, 2010
56. ## AP Chemistry

How many g of C2H5NH3Cl will be needed to combine with 4.7 g of C2H5NH2 to produce 0.250 L of buffer solution at a pH of 10.00? I can do this problem with mL and M but not w/out

asked by Kelly on February 11, 2018
57. ## chemistry

What mass of Na2CrO4 is required to precipitate all of the silver ions from 71.0 mL of a 0.101 M solution of AgNO3?

asked by Anonymous on October 18, 2013
58. ## 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
59. ## algebra

Write the equation for the following relation. Include all of your work in your final answer. Submit your solution. P = {(x, y): (1, 0), (2, 4), (3, 8), (4, 12),

asked by Anonymous on September 5, 2014
60. ## 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
61. ## science

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

asked by tricia on September 29, 2011
62. ## Chemistry

Ksp for AgBr is 5x10-13. What is the maximum concentration of silver ion that you can have in a 0.1 M solution of NaBr?

asked by Anon on January 30, 2018
63. ## Chemistry, Solutions

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

asked by Jason on September 16, 2010
64. ## science

number of grams of MgCl2 needed to prepare a 250ml of a 12% aqueous solution with 1.1g/ml density

asked by keith on June 28, 2016
65. ## 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
66. ## chemistry

When the following reaction is balanced in acid solution, the coefficient of H+(aq) will be: Cr2O72-(aq) + Sn2+(aq) --> Cr3+(aq) + Sn4+(aq)

asked by Becca on March 22, 2012
67. ## chem

calculate the pH for a solution that is made by combining 125ml of 6.0*10-2 M hydroflouric aid with 50 ml of .12 M sodium flouride?

asked by Nikki on March 4, 2010
68. ## chemistry

Name the product obtained on passing carbon iv oxide into saturated sodium trioxocarbonate (iv) solution

asked by Tobasco on May 21, 2016
69. ## chm

If 0.0490g of AgIO3 DISOLVES per liter of solution, calculate the solubility product constant.

asked by ami on June 27, 2010
70. ## chemistry

What is the boiling point of a solution composed of 15.0g urea, (NH2)2CO, in .500kg of water?

asked by Evelyn on January 19, 2011
71. ## chemistry

Commercial bleach contains 5.25% (by mass) of NaClO in water. It has a density of 1.08 g/mL. Calculate the molarity of this solution.

asked by Drew on March 3, 2010
72. ## Chemistry

How many grams of sucrose (molecular weight = 342.3 g/mol) would you dissolve in 350 ml to get a 7% solution?

asked by Rolando on February 4, 2014
73. ## Math - derivatives of cos and sin fucntions

a) Find an equation of a line that is tangent to y=2sinx and whose slope is a maximum value. b) Is there more than one solution? Explain.

asked by Farah on November 6, 2010
74. ## Algebra 2

The only solution of the equation ... x&2+bx-18 over (divided by) -2x+4 equals 4.... When x=-17. I plugged in the number and replaced x with -17 and it looks like this... (-17)^2 +(-17x)-18 over 38. I just got lost.

asked by Macin on June 2, 2015
75. ## 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
76. ## 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
77. ## chemistry

How many mL of propyl alcohol are required to make a 6.50 % v/v aqueous solution in a 100 mL volumetric flask?

asked by Anonymous on November 5, 2010
78. ## 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
79. ## chemistry

Suppose a solution containing 3.50 g of Na3PO4 is mixed with an excess of Ba(NO3)2. How many grams of Ba(PO4)2 can be formed.

asked by Kerry on March 4, 2010
80. ## chemistry

Calculate the amount of water (in grams) that must be added to 5.00 g urea in preparation of 16.2% by mass solution.

asked by baizura on June 28, 2016
81. ## 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
82. ## Differential Calculus

Given that p=(2q^2-5)^2. when q=3, it is increased by 0.7%. find the appropriate percentage in p. solution dp = 2(2q^2-5) (2dq) dp = (4x(18-5)(0.7%) dp = 4(13)(0.7%) am lost from here is dp=52x0.7/100= 0.364%

asked by matrix school 2 on August 14, 2009
83. ## 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
84. ## college

What is the concentration of a solution of HCL in which a 10.0 mL sample of acid required 50.0 mL of 0.150 M NaOH for neutralization?

asked by Anonymous on April 15, 2010
85. ## Chemistry

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

asked by Gweedo on June 9, 2009
86. ## Chemistry

Determine the freezing points of each 0.20m aqueous solution. a)K2SO4 b)CsNO3 c)Al(NO3)3

asked by Jack on April 29, 2010
87. ## science

If the soluton of ammonium chloride is heated to 75 degrees celcius, is the solution now sturated or un saturated?

asked by shay on May 5, 2011
88. ## Chemistry

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

asked by Danny on April 13, 2010
89. ## Math

Find the following indefinite integral ∫ (x^2 -8)/ (x^2 -16) dx My work ∫ (x^2 - 8) * ∫ (1/(x^2 - 16) ∫ (x^2 - 8) = [(x^3)/(3) - 8x)] + C ∫ (1/(x^2 - 16) = ∫ [(-1/8)/(x+4)] + [(1/8)/(x-4)] = (-1/8)*ln|(x+4)| +(1/8)*|(x-4)| + C So I get this,

asked by Georges on April 21, 2019
90. ## algebra

what is the solution of the following linear system? 2y + 6x = -24 y - 13x = -12 a) (0,-12) b) none c) (0,3) d) infinite number of solutions and the answer i picked i was a thanks!!!!!!!!!!!

asked by poo on May 1, 2010
91. ## 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
92. ## science

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

asked by Jon on October 7, 2010
93. ## 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
94. ## 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

95. ## algebra

Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x+3y+6z=6 y-4z=0

asked by steph on November 12, 2015
96. ## Chemistry

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

asked by JRoussel on May 10, 2011
97. ## Science

How many moles of mercury will be produced by electrolyzing 1.0M Hg(NO3)2 solution with a current 2.00A for 2 hours.

asked by Neha on February 20, 2017
98. ## chemistry

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

asked by gabriela on April 10, 2017
99. ## Chemistry

to prepare 50.0 g of 10% NaNo3 solution you will need how many grams of solute? i am having trouble settin these solutions equations up

asked by Emilee on May 8, 2017
100. ## 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