1. chemistry

    275 ml of active ingredient is added to 725 ml of an alcohol based solution. What is the final strength (v/v)

    asked by Kill on July 15, 2014
  2. 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
  3. chem

    suppose that 1.550g of hydrochloric is dissolved into 500.0ml of solution. what is the molar concentration of the acid?

    asked by frankie on March 18, 2013
  4. Chemistry Molarity

    What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

    asked by Toni Jones on March 28, 2011
  5. 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
  6. 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
  7. Chemistry

    What mass of Pb(No3)2 would be required to yield 9g of 3PbCl2 on the addition of excess sodium chloride solution

    asked by Jossy on September 27, 2015
  8. 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
  9. 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
  10. chemistry

    What assumption did you make about the reaction of KMnO4 solution in those determinations where temp didn't change to allow k to be a constant?

    asked by Frank on September 6, 2015
  11. 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
  12. Chem

    What mass of MgSO4 · 7H2O is required to prepare 700 mL of a 0.342MMgSO4 solution? Answer in units of g.

    asked by Chandler on September 11, 2011
  13. 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
  14. chemistry

    What stoichiometric concentration of the indicated substance is required to obtain an aqueous solution with the pH} value shown below? aniline (C6H5NH2) for PH of 8.90

    asked by anonymous on April 11, 2010
  15. Chemistry

    What is the concentration of C2O4^-2 in a 0.370M oxalic acid solution? Ka1=5.6x10^-2 and Ka2=5.1x10^-5

    asked by V on March 19, 2013
  16. 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
  17. Chemistry

    Which of the following ions can be reduced from an aqueous solution? A)Ba2+ B)Al3+ C)Sn2+ D)Na+ Do I look for the higher volts? Thanks in advance.

    asked by sh on November 18, 2009
  18. Chemistry 2

    Calculate the molality, molarity, and mole fraction of FeCl3 in a 25.7 mass % aqueous solution (d = 1.204 g/mL).

    asked by Anonymous on February 12, 2015
  19. Chemistry 105

    What is the molarity of a solution obtained by dissolving 10.35 g of KNO3 in some water and diluting to exactely 1 L in a graduated flask?

    asked by Mita on November 25, 2012
  20. 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
  21. chemistry

    if a 10 mL of the original 1.0M stock solution was added to a 500mL volumetric flask and diluted to the mark, what would be the new concentration?

    asked by Anonymous on June 5, 2013
  22. chemistry

    A quantity of 2.20 mol of CaCl2 are dissolved in 1.00 L of water. What is the freezing point of this solution at 1 atm of pressure?

    asked by Anonymous on May 18, 2011
  23. 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
  24. Chemistry

    Calculate mass of silver nitrate needed to prepare a solution of concentration 0.01 moles per liter.

    asked by Slim Shady on April 5, 2011
  25. Calculus - First Derivatives

    Find K'. Y = K^(0.25) * L^(0.75).... relates to Cobbs-Douglas function (dL/dK) = 0.25 (K/L)^(0.25) I got to this.... but answer is... (dL/dK) = 0.25 Y/L

    asked by Anonymous on September 27, 2009
  26. 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
  27. chemistry

    Calculate the pH and percentage protonation of the solute in an aqueous solution of 0.39 M quinine if the pKa of its conjugate acid is 8.52.

    asked by bob on April 24, 2012
  28. Chemistry

    What is the boiling point of a solution made using 731g of sucrose, C12H22O11, in 0.250kg of water,h2o ?

    asked by Garrett on December 6, 2010
  29. CHEMISTRY..please help..thanks

    A laboratory assistant needs to prepare 325 mL of 0.110 M CaCl2 solution. How many grams of calcium chloride will she need?

    asked by Jasmin on November 9, 2010
  30. chemistry

    hydrogen sulfide gas is bubbled through a solution of iron III chloride state and explain what happens

    asked by Anonymous on August 25, 2017
  31. Physical Science

    A 68.4-g sample of potassium chloride was added to 200.0 g of water at 20 C. Is the solution saturated, unsaturated, or supersaturated?

    asked by Steve on November 12, 2016
  32. math

    five times the number increased by thirteen is less than or equal to twice the nummmber decreased by twenty find the solution

    asked by drake on March 8, 2016
  33. chem

    How many moles of sodium chloride (NaCl) solute are in 155 grams of an 85.5 percent by mass solution?

    asked by bryan on January 17, 2012
  34. Chemistry

    What volume of a 0.164 M potassium hydroxide solution is needed to exactly neutralize 0.680 grams of KHP ?

    asked by Kele on October 7, 2012
  35. 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
  36. Chemistry

    In an aqueous solution containing a mixture of Zn2+and Mg2+, how would you determine their contents by means of EDTA titration?

    asked by Silvia on November 21, 2016
  37. 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
  38. Environmental

    Is there an effective way for coal-fired plants to effectively dispose of used scrubber solution after wet scrubbing?

    asked by L on March 5, 2019
  39. Science

    A student adds 5 g each of sand, sugar, and salt to 50mL of water. Did he make a solution? Explain.

    asked by Fabricio on March 29, 2017
  40. Chemistry

    Consider the reaction 2 Al2O3(s) → 4 Al(s) + 3 O2(g). ∆H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ?

    asked by Mary on January 10, 2014
  41. 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
  42. chemistry

    a sample of Na2SO3.H2O weighing 0.62g is addedto 100ml.1NH2SO4 .THE resulting solution will be?

    asked by cdscs on August 17, 2012
  43. chemistry

    What is the molality of a sodium chloride solution if 3.5 grams of the salt is added to 998 g of water Your Answer:

    asked by celina on September 10, 2008
  44. Chemistry Molarity

    What is the concentration, in units of molarity, of a 500mL solution containing 0.750 moles of sodium chloride in water?

    asked by Toni Jones on March 28, 2011
  45. chemistry

    0.1M solution of methanoic acid is found to have a ph of 2.4 at 25 degree celcius. Calculate the dissociation constant k at this temperature.

    asked by Olamide on March 26, 2011
  46. chemistry

    What is the pH of a buffer solution that has CH3CO2H=0.68 M and CH3CO2- =0.58 M, and has 0.01 M concentration of H2SO4 added to it? Ka of acetic acid is 1.8x10-5

    asked by Randy on November 11, 2015
  47. chemistry

    Which of the following when added to water will cause a significant change in the pH of the solution? 1 NH4HSO4 2 (NH4)2SO4 3 Na2SO4 I believe the answer is 1 & 2. is that right.

    asked by George2 on May 15, 2010
  48. Chemistry

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

    asked by Archie on February 9, 2016
  49. chemistry

    what mass of silver is deposited when an current of 2.6A is passed through a solution of silversalt for 40 minutes? (AG =108,F=96500C)

    asked by ifeoma on July 22, 2019
  50. chemistry

    Calculate the mass of silver nitrate needed to prepare a solution of concentration 0.01 moles per litre

    asked by Anonymous on April 4, 2011
  51. Chemistry

    what mass of silver is deposited when n current of 2.6A is passed through a solution of silversalt for 40 minutes? (Ag=108, F=96500C

    asked by Sadiq Hassan on July 22, 2019
  52. Chemistry

    How many number of ions of each type are present in the following aqueous solution? 113 mL of .490 M aluminum chloride.

    asked by Chris on October 4, 2011
  53. chemistry

    If 100 grams of a saturated solution of lead nitrate is cooled from 60c to 20c, what will happen

    asked by Mary on March 22, 2011
  54. Chemistry

    Calculate the amount (volume) of 0.135 M HClO4 solution required to neutralize 57.00 mL of .089 M NaOH

    asked by Vicky on October 6, 2012
  55. Calculus

    (b) Find a solution of the initial-value problem. (Hint: First verify that all members of the family y = 4/x + C are solutions of the given equation.) y' = −1/4y^2 y(0) = 0.25

    asked by Kaitlyn on March 16, 2016
  56. Chemistry

    A 0.600 m aqueous solution of KBr has a total mass of 69.0 g. What masses of solute and solvent are present?

    asked by Troy on December 1, 2015
  57. 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
  58. 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
  59. chemistry

    Three solutions 56.0 mL of 0.2 M KNO3; 57.0 mL of 0.6 M Ca(NO3)2; and 57.0 mL of 0.325 M KCl were poured together to make one new solution. What is the concentration of Cl− after mixing?

    asked by selom on September 15, 2014
  60. chemistry II

    Calculate the grams in solute: 300 g of water in the preparation of 15.0% NaNO solution. Atomic Weight: Na=23,N=14,o=16.

    asked by criss on December 17, 2012
  61. 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
  62. Chemistry

    Consider 51.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.210. What volume of water must be added to make the pH = 5.000 I've tried everything but I am not getting the right answer!

    asked by M on January 26, 2014
  63. Chem

    For a solution that is 0.280 M HC3H5O2 (propanoic acid Ka=1.3*10^-5) and 0.0894 M HI, calculate the following. Concentration of H30, OH, C3H5O2-, I-

    asked by Joe on April 14, 2011
  64. college2

    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
  65. 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
  66. chemistry

    How many grams of Ni(OH)2 are produced from the reaction of 25.0mL of a 0.600M NaOH solution? NiCl2(aq)+2NaOH(aq)→ Ni(OH)2(s)+2NaCl(aq)

    asked by anatasya on November 4, 2013
  67. Chemistry

    A saturated solution of sodium nitrate at 70oC is cooled to 40oC.  How many grams of precipitate are formed?

    asked by Leah on May 6, 2012
  68. 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
  69. chemistry

    what mass of zinc chloride, zncl2 is required to prepare 5.00l of a 0.450 molar solution

    asked by dolly on December 11, 2011
  70. chemistry

    How many grams of water are required to dissolve 27.8g of NH4(NO3)(MM=80.05 g/mol)to make a 0.500M solution?

    asked by Carrie on March 4, 2012
  71. Chemistry

    If chlorine was bubbled through aqueous iron 2sulphate solution state what would be observed and ionic equation

    asked by Nekesa on May 21, 2019
  72. trigonometry-math

    what is the solution set (in terms of pi) of the equation sin2t-cos^2t=1=sin^2t+sint in the interval 0

    asked by renee on May 1, 2011
  73. 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
  74. Chemistry

    what mass of hydrogen chloride gas is required to produce 250 ml of hydrochloric acid solution with a pH of 1.57

    asked by John on April 9, 2016
  75. 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
  76. Chemistry

    How many milliliters of a 0.1 Molar NaOH solution is needed to neutralize 1 liter of lemonade containing 25% citric acid?

    asked by Katie on August 5, 2011
  77. chem

    methanoic acid react with potassium dichromate to form what? A colorless solution and CO2 is formed as known

    asked by david on November 9, 2008
  78. Chem 2

    How many grams MgCl2 will be formed from 25.6 mL of a 0.100M HCl solution reacting with excess magnesium metal

    asked by Cassidy on December 17, 2012
  79. 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
  80. 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
  81. Chemistry

    Molarity What is the final volume (in Liters) of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

    asked by Sara on May 1, 2015
  82. 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
  83. chemistry

    calculate the mass of Cuso4.5H2O required to prepare 500 cm3 of a 0.400 m/dm-3 solution

    asked by alice on June 8, 2014
  84. Chemistry

    describe how you would prepare 250.0 mL of a .500 M solution of NaCl by using apparatus found in a chemistry lab.

    asked by Noemi on May 30, 2012
  85. 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
  86. 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
  87. Math

    Determine which ordered pair is a solution of y = -5x + 10. A. (-15, 5) B. (2, 0)•• C. (-1, -5) D. (3, 25) Find the slope of the line through (-9, 10) and (-2, -5). A. -5/7 B. 7/5 C. 5/7 D. -7/5 If so can someone please describe how to get awnsers I

    asked by Memed on April 9, 2018
  88. Chemistry

    Given below are aqueous solutions of strong electrolytes. For each solution, specify the concentration of each ion 0.15 M NH4NO3 (aq) 0.120M Mg(NO3)2(aq)

    asked by Kevin on May 5, 2018
  89. gen chem

    what is the concentration of an aqueous solution when you add 9.58x10^-4 moles of copper nitrate to 42ml of water

    asked by Rob on October 17, 2010
  90. science

    You add 12.5 mL of 4.15 acetic acid to 25.0 mL of 1.00 M NaOH. Calculate the hydronium ion concentration and pH of the resulting solution.

    asked by Bill on March 7, 2011
  91. chemistry

    whats the difference between making an aqueous solution of potassium chloride, KCL, and one of ammonia, NH3

    asked by lindsey on August 14, 2011
  92. science

    I feel like this is really simple, but I don't know where to start with this question. Explain how to make 250mL of 20%sucrose solution.

    asked by am on September 15, 2012
  93. chemistry

    calculate the number of grams of co2 that can be absorbed by complete reaction with a solution that contains 5.00 g of sodium hydroxide

    asked by Anonymous on February 9, 2010
  94. Chemistry

    What mass of copper(ii) sulphate(GFM=159.5) is required to make 400cm3 of 0.5mol/l solution

    asked by Callum on March 31, 2016
  95. 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
  96. ap chemistry

    what is the galvanic cell for the redox reaction between sodium dichromate and mercury(I) nitrate in an acidic solution.

    asked by brian on October 15, 2010
  97. please 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 16, 2010
  98. Precalculus

    10x^2=2^x Hi! How do I go about solving an equation like this? It's meant to be a calculator solution but I'd love to know how it's done by hand. Logarithms maybe? .. Thank you in advance (:

    asked by Kay on November 6, 2015
  99. 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
  100. 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

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