# 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 172
1. ## Chemistry

A mass of 0.100 mg TIOH is mixed with 174 ml of pure water. Calculate the pH of this aqueous solution?

asked by Kelly on January 23, 2016
2. ## Chemistry

Calculate the molality, molarity, and mole fraction of FeCl3 in a 39.2 mass % aqueous solution (d = 1.238 g/mL).

asked by Stevi on February 16, 2013
3. ## physics

what is the electric flux through a sphere that has a radius of 2.2m and carries charge of 5.3 micro couloumb at its centre? solution

asked by Temitope on February 9, 2016
4. ## Chemistry

Calculate the pH of a buffer solution obtained by dissolving 16.0 g of KH2PO4(s) and 27.0 g of Na2HPO4(s) in water and then diluting to 1.00 L. (pKa=7.21)

asked by Jematormal91 on March 29, 2012
5. ## chemistry

describe how you would prepare 500 mL 0.250 M ethylene glycol (MW=62.07) from concentrated 31% (w/w) solution that has a density of 1.0350 g/mL

asked by jessica on January 29, 2013
6. ## chemistry

describe how you would prepare 500 mL 0.250 M ethylene glycol (MW=62.07) from concentrated 31% (w/w) solution that has a density of 1.0350 g/mL

asked by jessica on January 29, 2013
7. ## chem "help"

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 13, 2010
8. ## chemistry

A 200.0mL solution with 3.1 x 10^-3 mol of MA will begin to precipitate at 19.4 C. Calculate each of the following at this temperature. a) Ksp b)change in G

asked by KAMILAH on April 13, 2014
9. ## chemestry

show a correct numerical setup for determining how many litters of a 1.2M solution can be prepared with a .50 mole of c6h12o6

asked by edward on January 19, 2011
10. ## intermediate algebra

solve an inequality and indicate the solution set, in interval notation. i need the steps that way i can study it and try to do the rest on my own. 3x+1>2andx-2

asked by suzy on September 25, 2012
11. ## chemistry

What is the concentration, in units of molarity, of a 350 mL solution containing 0.298 moles of sodium chloride in water?

asked by Bekah on September 27, 2011
12. ## chemistry

What volume of 0.010M silver nitrate will exactly react with 20ml of 0.0080M socium chloride solution?

asked by bliss on January 26, 2013
13. ## science

what is the morality of a solution made by dissolving 1.00g of sodium hydroxide, NaOH in 100 mL of water

asked by c on June 12, 2011
14. ## BIOCHEMISTRY

WHAT CONCENTRATION OF SOLUTION DO YOU GET IF YOU DISSOLVE 45G OF GLUCOSE (MOLECULAR WEIGHT =180) IN 500ML OF WATER?

asked by ELAINE on March 10, 2010

Why is it important in gravimetric analysis to add an excess amount of precipitating ions to a solution containing an analyte

asked by Morgan on December 2, 2014
16. ## chemistry

15mg of sodium chloride is present in 1kg of solution. express the concentration in ppm and ppb.

asked by Apoorva on July 27, 2016
17. ## Chemistry

How many grams of solute are required to make a 789 mL solution of calcium acetate with a concentration of 0.0049 M?

asked by Dan on May 16, 2016
18. ## Chemistry

How many milliliters of a 0.1 M NaOH solution is needed to completely neutralize 1 liter of lemonade containing 25% citric acide

asked by RS High School on November 9, 2010
19. ## Chemistry

How much water must be added to 963 g of solid sodium hydroxide needed in order to prepare a 1.50 M solution?

asked by Anonymous on August 27, 2014
20. ## chemistry

15gm of sodium chloride is present in one kilogram of solution.express the concentratiom in ppm and ppb

asked by hussain on July 27, 2016
21. ## Chemistry

What is the pH of a solution that results from adding 0.075 mol Ca(OH)2 (s) to 1.71 L of a buffer comprised of 0.37 M CH3COOH and 0.37 M CH3COONa? Any help is appreciated!

asked by Anonymous on July 31, 2013
22. ## Chemistry

How many grams of solute are required to make a 976 mL solution of sodium hydroxide with a concentration of 0.0783 M?

asked by Alex on May 16, 2016
23. ## chemistry

Which salt below will dissolve in water to yield an acidic solution? a) NaNO2 b) K C§¤O4 c) NH4NO3 d) Na2CO3 e) Mg Br2 help!

asked by bob on March 17, 2012
24. ## Chemistry

How many grams of nitric acid (HNO3) must be dissolved in 740 mL of water to make a solution with a pOH = 8.3?

asked by Natasha on May 12, 2013
25. ## Chemistry

Nicotine is a basic substance and its dissociation constant is about 1.0 x 10-6. To prepare a solution water with 0.01 mol L-1, calculate the PH

asked by Alan on January 22, 2016
26. ## science

Why can salt water be considered both a mixture and a solution? Describe what is happening at the particle level when an M&M dissolves.

asked by Astrid on March 17, 2008

Why can salt water be considered both a mixture and a solution? Describe what is happening at the particle level when an M&M dissolves.

asked by astrid on March 17, 2008

explain the concept of a “stock solution” and standard solutions as if you were explaining it to a friend who is not studying chemistry.

asked by michael on April 30, 2013
29. ## Chemistry

in a neutralization reaction, dilute tetraoxosulphate (vi) acid completely reacted with sodium hydroxide solution

asked by Archie on February 9, 2016
30. ## OPERATIOnS RESEARCH

Obtain an initial and optimum solution to the following transportation problem using Vogel’s Approximation method. To Available 7 3 2 2 2 1 3 3 3 4 6 5 Demand 4 1 5

asked by selvi on June 28, 2010
31. ## chemistry

The molarity of a solution prepared by dissolving 15.0 grams of NaCl in 100 mL water is 0.15 M. True or False

asked by Anonymous on December 5, 2011
32. ## chemistry

14. The reaction H2S (aq) = HS-(aq)+ H+(aq) has pK = 7 at 298 K, 1bar. Consider a solution in which total dissolved sulfur is 10^-5 molal. At pH = 3, pH2S =

asked by Anonymous on May 12, 2013
33. ## chemistry

What volume of 0.076M HNO3 is required to titrate 20.0ML of 0.25M Ba(OH)2 solution? use 2 sig figures

asked by jennifer on June 16, 2015
34. ## Chemistry

What is the pH of a 0.0050 M solution of sodium fluoride? I got 7.58 for pH. Is it correct? but I try to plug in my quadratic formula, I don't get the pH 7.58. I'm really confuse. Please help.

asked by Matt on October 12, 2015
35. ## chemistry

A chemist dilutes 144.0 mL of 0.0743 M HCl with 775.0 mL of water. Determine the pH of the diluted solution. 1.86, 1.13, 2.08, 1.93, 12.07

asked by Anonymous on December 5, 2011
36. ## Math

Elena wrote the equation 5x = 25. She wants to multiply 25 by 5 to solve it. Does this make sense? Explain why or why not, and then give the solution.

asked by DA QUEEN on February 7, 2018
37. ## chemistry

calculate the molality, molarity, and mole fraction of NH3 in an 12.80 mass % aqueous solution (d=0.9651 g/ml)

asked by maria on September 8, 2014
38. ## Chemistry

Redox Reactions Can anyone help predict the reaction that will take place when Gold is put into a solution of Hydrochloric Acid?

asked by Anonymous on March 1, 2008
39. ## Chemistry

What is the vapor pressure of a aqueous solution containing 10 % (by weight) ethylene glycol (62 g/mol) at 25 °C. PH2O = 24.3 torr at 25°C?

asked by Marcus on February 10, 2013
40. ## chem hw "help"

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 15, 2010
41. ## college chemistry

Balance the equation in aqueous basic solution: Fe(CN)64-(aq) + Ce4+(aq) → Ce3+(aq) + Fe3+(aq) + CO32-(aq) + NO3-(aq)

asked by sparkle on November 4, 2010
42. ## chemistry

the ph of the resulting solution when 1.15g of sodium metal is reacted slowly in 500cm3 of water is close to

asked by durshetti balaji on May 30, 2016
43. ## Chemistry

A 1.00 L solution saturated at 25°C with lead(II) iodide contains 0.54 g of PbI2. Calculate the solubility-product constant for this salt at 25°C. thanks

asked by Rebekah on April 27, 2011
44. ## chemical water treatment

a solution is made up of 0.001M dichloroacetic and 0.0001M acetic acid.find the pH using the charge balance

asked by tsogwane on February 9, 2013
45. ## Chemistry

27.31 mg of NH4Cl in 1.99 ✕ 10-2 L of solution cation ? And Anion ? (Molarity) I found the MW to be 62.48 and I converted Mg to 0.02731g idk what's wrong

asked by Asher on January 29, 2015
46. ## Ochem

What volume of 6.83% (wt./vol.) NaOCl solution is required to oxidize 223 mg of 9-fluorenol to 9-fluorenone? Please help me set this up!

asked by Darby on February 1, 2012
47. ## CHEMISTY

WHAT IS THE MOLARITY OF A SOLUTION PREPARED BY DISSLOVING 4.92 GRAMS OF CALCIUM NITRATE, Ca(NO3)2 in 250 mL OF WATER?

asked by Persia on July 21, 2008
48. ## chemistry

What is the molarity of OH- in a 7.68×10-4 M NaClO solution that hydrolyzes according to the equation. ClO-(aq) + H2O(l) = OH-(aq) + HClO(aq) Constants: Kh=2.86×10-7 Can someone help me figure this one out?

asked by axl on November 4, 2010
49. ## chemistry

What is the molarity of OH- in a 7.68×10-4 M NaClO solution that hydrolyzes according to the equation. ClO-(aq) + H2O(l) = OH-(aq) + HClO(aq) Constants: Kh=2.86×10-7 Can someone help me figure this one out?

asked by axl on November 4, 2010
50. ## chemistry

A solution is prepared by adding 50 mL of .050 M HCL to 150 mL of .10 M HNO3. Calculate the concentrations. I know I need to find the [H+] and [OH-] but im not sure how.

asked by Dannie on March 7, 2010
51. ## math143

2x3-4x2+23=y A.is(-4,-167) a solution? Show/explain b.is(3,51) a point on the graph c.give the y-intercept

asked by John on June 7, 2016
52. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
53. ## chemistry

For each solution whose pH value deviated from 7.0 by at least 1.0 pH unit, give an equation accompanied by a statement which gives the reasons and/or explanation for the deviation.

asked by mary on January 31, 2012
54. ## Chemistry II

You place 1.234 g of solid Ca(OH)2 in 1.00 L of pure water at 25°C and it partially dissolves. The pH of the solution is 12.40. Estimate the Ksp for Ca(OH)2.

asked by Kelly on March 27, 2012
55. ## college chemistry

Balance the equation in aqueous acidic solution: C2O42-(aq) + MnO4-(aq) → Mn2+(aq) + CO2(g) please teach me how to do it!

asked by sparkle on November 4, 2010
56. ## bio

During lab, you are provided with a stock antibody solution (Ab) that has a concentration of 400 μg/μl (Tube 1). It is necessary make the following dilutions.

asked by Anonymous on October 9, 2015
57. ## chemistry

What is the molality of a solution consisting of 34.0 mL of benzene (C6H6; d = 0.877 g/mL) in 187 mL of hexane (C6H14 ; d = 0.660 g/mL)?

asked by prince flahn on May 2, 2017
58. ## chemistry

How many grams of sodium chloride are needed to prepare a 0.400m NaCl solution that contains 750g of water?

asked by ANA on February 3, 2011

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
60. ## chemistry

The number of moles of solute in a bottle containing 300 mL of 0.178 mol/L sodium sulfite solution is

asked by ronnie on March 16, 2015
61. ## Chemistry

Why is conc. Sulphuric acid used as a drying agent? Is it because it is hygroscopic it will absorb water without forming a solution?

asked by Anonymous on October 26, 2009
62. ## chemistry

calculate the enthalpy of mixing for the solution of 10% platinum and 90% gold .express your answer in units of kg/mole

asked by himani. on May 7, 2013
63. ## ap chemistry

Calcu- late the mass of pure acetic acid in 440 mL of this solution at 20 C. Answer in units of g.

asked by brian on October 1, 2010
64. ## chemistry

If 0.075 g of MgF2 dissolves per liter of solution, calculate the solubility-product constant. I got 2.0e-9 but it was not correct.

asked by Rebekah on April 27, 2011
65. ## chemistry

What is the percentage purity of sample if 3.92g of mohr's salt react completely with 50 ml N/10 Kmno4 solution

asked by ketaki on June 25, 2012
66. ## chemistry

how many grams of beryllium chloride would you need to add to 125 ml of water to make a .050 molal solution

asked by collin on February 3, 2011
67. ## Chemistry

Suppose you wanted to produce an aqueous solution of pH = 8.60 by dissolving one of the following salts in water: KNO2 At what molarity?

asked by NoName on February 22, 2018
68. ## chemistry

How many milliliters of an aqueous solution of 0.165 M aluminum chloride is needed to obtain 13.2 grams of the salt?

asked by lanorris on December 1, 2014
69. ## Math

Find the smallest positive integer n such that the equation 455x+1547y=50,000+n has a solution (x,y) where both x and y are integers

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
71. ## Math 116 algebra please check

Solve 0.3x + 8 < 1.1x-9 The solution is x > 85/7 The problem with the greater than sign has a line under it but I can get it to work correctly from my word document

asked by jay jay on July 16, 2008

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
73. ## chemistry

the maximum solubility of nacl in water to form brine at 0 c is 26% (mass/volume.) the density of the solution is 1.2 g/ml

asked by cariel on January 31, 2018

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effect

asked by moon on September 16, 2010
75. ## Chemistry

Given the following standard reduction potentials in acid solution write the formula of the weakest reducing agent.

asked by Durbin23 on May 7, 2017
76. ## math

How many positive integers less than 1020 have all their digits the same? also give the solution kindly,,,,,,,,,and thanx a lot for the last question's answer

asked by jamesbond on May 13, 2013
77. ## chemistry

What volume of a 0.34M MgCI2 soultion is required to make 250ml of a 0.10M solution by dillution?

asked by twynna on February 20, 2011
78. ## analytic geometry helps are appreciated

Find the maximum value of y/x over all real numbers x and y that satisfy (x-3)^2+(y-3)^2 = 6. It is a circle, but how do we even begin? As a matter of fact, how is there not only like 1 solution??

asked by Knights on March 1, 2013
79. ## chemistry

What volume of solution should be dispensed from the buret to provide 3.718 mmol CO3 2-? answer in units of mL.

asked by chemistrry help! on May 2, 2010
80. ## chemistry

In comparing normal blood concentrations are the solution 0.01% (m/v) NaCl isotonic, hypertonic, or hypotonic and could you explain?

asked by veronica, rena, joshua on August 9, 2013
81. ## biology

you added 3ml stock solution of 0.05mg/ml of dye and 7ml of water, what will be the final concerntration.

asked by cindy on February 21, 2017
82. ## calculus

solve the following inequality. write your solution in interval notation. x^3+9x^2-108 less than or equal to 0 please show all work

asked by Josh on December 24, 2012
83. ## inorganic chemistry

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effet

asked by moon on September 11, 2010
84. ## Chemistry

Prepare 250ml of 0.2M phosphate buffer of pH 6.4.starting from Na2HPO4,NaH2PO4,0.129N NaOH solution.

asked by Rita on July 10, 2015
85. ## chemistry

What is the molality of a solution composed of 192g of acetone ((CH3)2CO) dissolved in 416g of water

asked by Anonymous on February 25, 2010

Find the maximum value of y/x over all real numbers x and y that satisfy (x-3)^2+(y-3)^2 = 6. It is a circle, but how do we even begin? As a matter of fact, how is there not only like 1 solution??

asked by Knights on March 1, 2013
87. ## chemistry

Calculate the Ka of nitrous acid if a 0.200 mol/L solution at equilibrium at SATP has a percent ionization of 5.8%

asked by Laura on April 5, 2008
88. ## Chemistry

Calculate the mass of HONH2 required to dissolve in enough water to make 255.5 mL of solution having a pH of 10.02 (Kb = 1.110−8).

asked by Margaret on February 28, 2013
89. ## math

period of a 100 MHz FM radio were is roughly 1 X 10 to the negative 8th s. formulate a problem and solution.

asked by feix on November 28, 2018
90. ## calculus

solve the logarithmic equation. Be sure to reject any value of x that is not in the domain. In square root x+7=1 x= ? What is the decimal approximation to the solution? x= ?

asked by NayNay on January 1, 2013
91. ## Math, physics, chemistry

calculate total ionic strength of solution in which concentration of CuSO4 and Al2(SO4)3 is 0.1 molar

asked by Danish malik on February 1, 2017
92. ## chemistry

Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 3.63. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10. I'm completely lost help please!

asked by Linda on May 23, 2013
93. ## geometry

Which of the following choices represents a type of problem with an angle as a solution? cos0 Arcsin 0.5 secB tan60

asked by D.J on April 23, 2018
94. ## chemistry

In comparing normal blood concentrations are the solution 0.01% (m/v) NaCl isotonic, hypertonic, or hypotonic and could you explain?

asked by veronica, rena, joshua on August 9, 2013
95. ## in organic chemistry

What is the ratio of the activities of Zn 2+ and Pb 2+ in a solution that is in equilibrium with respect to sphalerite and galena?disregard hydrolysis effet

asked by moon on September 11, 2010
96. ## Math

Ues the Gaussian elimination to find complete solution to the equation or show that none exist 5x+12y+z=10 2x+5y+2z=-1 x+2y+-3z=5

asked by Tonya on February 21, 2011
97. ## chemistry

What would be the pH of a solution that liberates carbon dioxide from sodium carbonate. Give chemical equation and reason

asked by clive on July 14, 2015
98. ## Math

Show all work solve the Math: Polynomial inequality and express the solution in set notation. 2t^2 - 3 < or = to t

asked by Anonymous on October 18, 2011
99. ## Chem 2

What is the molal concentration of a solution made by dissolving 34.2g of sucrose (C12H22O11) (molar mass 342.34)

asked by Cassidy on December 17, 2012