# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 108
1. ## algebra

how many liters of distilled water must be added to 80 liters of 60% acid solution to obtain a 50 % acid solution?

asked by cheszka on June 8, 2017
2. ## chemistry

How many liters of water must be added to 4 liters of a 6 molar HNO3 solution to create a solution that is 2 molar?

asked by Hiba on September 14, 2010
3. ## Math

How many milliliters of pure acid must be added to 150 milliliters of a 70% solution of acid to obtain a 80% solution?

asked by Anonymous on February 18, 2013
4. ## Chemistry

a sulfuric acid solution that is 65.0 h2so4 by mass has a density of 1.55 g/mL. What is the molality of sulfuric acid in this solution

asked by Scott on May 31, 2014
5. ## Chemistry

A sulfuric acid solution that is 65.0% H2SO4 by mass has a density of 1.55 g/mL at 20°C. What is the mass of h2so4 per liter of solution?

asked by Veronica on May 31, 2014
6. ## chemistry

I fyou had only 12g of KOH remaining in a bottle, how many ml of 12.8%(w/v) solution could you prepare? (in mL) How many ml of 0.29 M solution could you prepare using 12 g of KOH?

asked by nicole on November 21, 2010
7. ## Math

Solve the following system of equations. x + 4y= 8 (1) x=5-4y (2) What is the solution of the system? (Type an ordered pair. Type N if no solution).

asked by Melinda on August 2, 2008
8. ## College Algebra

How much water must be evaporated from 32 ounces of a 7% salt solution to make a 8% salt​ solution? (Answer is in ounces)

asked by Ana on August 27, 2017
9. ## Chemistry

If a basic solution has a pH of 11.88, is it considered to be a strong base? Is an acidic solution with a pH of 4.44 considered to be a strong acid?

asked by Jessica on December 10, 2015
10. ## chemistry

you must prepare 300 mL of .750M NaBr solution using 2M NaBr stock solustion. how many mL of stock solution should you use?

asked by abby on March 17, 2011
11. ## Chem

Can you show me step by step how to do the following problems? How many grams of KI are in 25.0 mL of a 3.0 % (m/v) KI solution? How many milliliters of a 2.5 M MgCl2 solution contain 17.5 g MgCl2?

asked by Kariann on March 29, 2011
12. ## Algebra

how much pure acid must be added to 15 ounces of an acid solution which is 40% acid in order to produce a solution which is 50% acid?

asked by Anonymous on January 12, 2014
13. ## Algebra 1

What is the solution set for an equation in which all numbers work? How big is the solution set for an equation that cannot be solved?

asked by Wendy on October 7, 2009
14. ## Chemistry

a stock solution of perchloric acid is 75.5% perchloric acid and has a density of 1.67g/ml. What is the molarity of the solution?

asked by Michelle on November 23, 2012
15. ## chemistry

Suppose you have a solution containing both an iron ii salt and an iron iii salt. how would you proceed to identify both Fe 2+ and Fe 3+ in this solution?

asked by Ash on February 12, 2013
16. ## chemistry

A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3.

asked by Monique on November 6, 2011
17. ## Chemistry

You have a stock solution of 13.4 M NH3. How many milliliters of this solution should you dilute to make 100.0 mL of 0.100 M NH3

asked by Nancy on October 15, 2010
18. ## math

what is the concentration of the mixture of two mixture if two quarts of 30% acid solution is mixed with 3 pints of 20%acid solution

asked by tasu on June 15, 2016
19. ## DrBob222-re: chem question

Sorry, I did make an error when I posted the earlier question: It should have said: A solution has [OH-] = 2.0 x 10-^14 M. The [H+] in this solution is? I hope you can help. Thank you. Sorry about the earlier error.

asked by Cassandra on April 23, 2015
20. ## chem

How do you prepare a solution of 12 M HCl and want to prepare 500 mL of a 0.4 M solution. Assume you have a 500-mL volumetric flask

asked by maggie on October 16, 2012
21. ## pharmacy math

RX Potassium Chloride 3:5 solution 30ml. how many millimeters of a potassium chloride 2:5 solution do you need to prepare the order?

asked by cleondra on August 12, 2012
22. ## Math

Write the equations described below. a) an addition equation with one variable that has a solution of 3 b) a subtraction equation with one variable that has a solution of 2/3

asked by Bryn on February 6, 2018
23. ## Chemistry Lab

You need 123 mL of 0.245 M NaOH solution for a certain experiment, and the only solution available in the lab is 1.252 M. How many mL OF THE 1.252 M NaOH would you need?

asked by Thao on May 10, 2011
24. ## DON VASCO PATNA

A salt solution of 15 litres contains 20% salt.How much water must you add to salt solution in order to dilute it 15% salt?

asked by YATHART on November 21, 2014

How do you determine if an element or compound is Aqueous, Solid, Liquid, or Gas just looking at a periodic table. Also, how do you determine if a compound or element is insoluble or soluble by looking at just the periodic table. What's the net ionic

asked by Anthony Clay on January 16, 2012
26. ## chemistry

Equillibrium, an example given by my textbook confused me. First it shows a reaction inside a soft drink: co2(g)-->

asked by kevin on August 6, 2009
27. ## chemistry

20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour

asked by dan on May 9, 2014
28. ## PHYSICS

A box slides down a frictionless, 10-meter, 30o incline. Calculate the gravitational potential energy at both the beginning and end of the motion. Calculate the work done by GRAVITY as the box slides down the incline. Compare this to the overall change in

asked by Help! on March 23, 2016
29. ## Physics

A horse canters away from its trainer in a straight line, moving 110 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.4 s. (a) Calculate its average speed. m/s (b) Calculate its average velocity for the entire trip, using "away from

asked by Jon Tres on August 29, 2018
30. ## phy

A horse canters away from its trainer in a straight line, moving 140 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.0 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

asked by ami on August 27, 2010
31. ## Physics

A horse canters away from its trainer in a straight line, moving 160 m away in 12.0 s. It then turns abruptly and gallops halfway back in 4.5 s. (a) Calculate its average speed.m/s (b) Calculate its average velocity for the entire trip, using "away from

asked by Megan on January 30, 2011
32. ## Physics

A horse canters away from its trainer in a straight line, moving 130 m away in 13.0 s. It then turns abruptly and gallops halfway back in 5.4 s. a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

asked by royaa on October 5, 2012
33. ## AP Physics

A horse canters away from its trainer in a straight line, moving 100 m away in 19.0 s. It then turns abruptly and gallops halfway back in 5.4 s. (a) Calculate its average speed. b) Calculate its average velocity for the entire trip, using "away from the

asked by Giulianna on September 3, 2014
34. ## phy

A horse canters away from its trainer in a straight line, moving 140 m away in 16.0 s. It then turns abruptly and gallops halfway back in 5.0 s. (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

asked by ami on August 26, 2010
35. ## Physics

Horse canters away from its trainer in a straight line moving 130 m away in 16.0 s. It then turns abruptly and gallops halfway back in 4.3 s? (a) Calculate its average speed. (b) Calculate its average velocity for the entire trip, using "away from the

asked by Joshua on October 6, 2015
36. ## Chemistry

The values of Ksp for silver bromide, AgBr is 7.7x10^-13, and silver chloride, AgCl is 1.6x10^-10. A solution containing a mixture of 2.0x10^-2 M Br^- and 2.0x10^-2 M Cl^- is a candidate for separation using selective precipitation. Solid AgNO3 is added

asked by Sam on July 27, 2010
37. ## Chemistry

An iron nail with a mass of 0.750 g was dissolved in dilute sulfuric acid and diluted to 100.0 mL volume. A 10.0 mL aliquot of this solution was then titrated with standard 0.200 M potassium permanganate solution, according to the following equation: MnO4-

asked by Marina on January 3, 2016
38. ## Physical Chemistry

Determine the temperature change when 18.0 g of the following salt is dissolved in 190. g of water. The specific heat capacity of water is 4.184 J·K-1g-1. The enthalpies of solution in the table are applicable. Do not take the added mass of the salt into

asked by Trixie on February 10, 2010
39. ## Chemistry

can anyone help me on my chemistry problem. i need a merck index to solve this. i have a PH of 10.7 and the nearest solution that is near to it is 10.32. The solution that is 10.32 is NaHCO3. i subtract both of them to get the ratio of log (HA)/(A-). i

asked by Chris on October 18, 2007
40. ## north kansas city high school

Calculate the resultant of the pair of velocities 100km/h north and 75 km/h south. Calculate the resultant if both of the velocties are directed north.

asked by Anonymous on June 30, 2009
41. ## Organic Chemistry

A half-life of a H2O2 solution at a certain condition is 4 weeks. You have a 100 mL of 1.00M H2O2 solution. How many moles of H2O2 will be left in the solution after the following weeks? 04 weeks after: moles 08 weeks after: moles 16 weeks after: moles 20

asked by Ashley on July 1, 2012
42. ## Chemistry

A half-life of a H2O2 solution at a certain condition is 4 weeks. You have a 100 mL of 1.00M H2O2 solution. How many moles of H2O2 will be left in the solution after the following weeks? 04 weeks after: moles 08 weeks after: moles 16 weeks after: moles 20

asked by Ashley on July 1, 2012
43. ## Chemistry

What effect on the molar mass of the unknown acid would each of the following have-that is-would it make the calculated molar mass high, low, or would it have no effect? 1. Adding 5 drops of phenolphthalein instead of 1 drop. 2. Using a standard NaOH

asked by Sean on April 3, 2013
44. ## chemistry

To a 100.0 mL solution containing 0.0100 M Ba(NO3)2 and 0.0100 M Pb(NO3)2 was added 101.0 mL of 0.0100 M H2SO4 to provide a slight excess of SO42- relative to Ba2+ in the resulting solution. Assuming that: i) H+ does not bind to SO42- ii) ionic strength

asked by john on November 4, 2015
45. ## Statistics

You have heard the commercial for the restaurant that lets you pick any 3 appetizers, any of the 6 entree items and then a dessert. You have been told there are 72 different meal options. How many desserts are available? I don't understand how to calculate

asked by Kim on May 26, 2009
46. ## Chemistry

The reaction of aqueous solutions of barium chloride and sodium sulfate results in the formation of a precipitation of barium sulfate. Sodium chloride is also formed but is soluble in water. Why would you use filtration to isolate the barium sulfate rather

asked by teetee on March 8, 2012
47. ## chem

When hydrochloric acid reacts with magnesium metal, hydrogen gas and aqueous magnesium chloride are produced. What volume of 1.0 M HCl is required to react completely with 4.00 g of magnesium i did 4.00g x (mol/24.31 g Mg) x (2 mol HCl/1 mol Mg) x (L/!.0

asked by Anon on March 26, 2009
48. ## 1 more chem check.

Alright, here is my question: 22. References list the Ka value of hydrosulphuric acid, H 2S(aq) , as 1.1 x 10^–7 at 25°C. Assume a solution is prepared by dissolving 1.00 g of H2S(g) to make 1.00 L of acidic solution. What percentage of this solution

asked by Jacy on July 20, 2006
49. ## Chemistry

To what volume should you dilute 124mL of an 8.10M CuCl2 solution so that 49.0mL of the diluted solution contains 4.81g CuCl2? Molar Mass of CuCl2= 134.45 g/mol Convert: 4.81g * (1mol/ 13.45g CuCl2)= 0.0358mol CuCl2 [CuCl2]= M= mol/L= (0.0358mol/ 49ml) *

asked by Nyle on February 21, 2015
50. ## Critical Thinking

Nick is chief engineer in a phosphate fertilizer plant that generates more than 1 million tons per year of gypsum, a waste collected in a nearby pile. Over many years, the pile has grown into a mountain containing 40 million tons of waste. There is little

asked by Aya on November 25, 2011
51. ## Physics

If a supersaturated sugar solution is allowed to evaporate slowly, sugar crystals form in the container. Hence, sugar molecules go from a disordered form (in solution) to a highly ordered, crystalline form. Does this process violate the second law of

asked by S on November 25, 2012
52. ## chemistry

A student is asked to standardize a solution of barium hydroxide. He weighs out 0.986 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 27.8 mL of barium hydroxide to reach the endpoint. A. What is the molarity of the

asked by charlotte on October 5, 2015
53. ## Chem

4 NH3 + 3 O2 --> 2 N2 + 6 H2O a.) Assume 3.0 mol O2 completely reacts. Calculate the moles required for the other reactant. Calculate the moles that can be produced for each product. b.) Assume 8.0 mol NH3 completely reacts. Calculate the moles required

asked by Deni on February 13, 2016

A solution is prepared by dissolving 3.44 g of sucrose, C12H22O11, in 118 g of water. a) What is the molality of the resulting solution? b) What is the mole fraction of water in this solution? B) moles of h2o=118g/18(g/mol)=6.5556 mol moles of c12h22O11=

asked by Kate on January 16, 2014
55. ## Finance

31. Suppose the market portfolio is equally likely to increase by 30% or decrease by 10%. a. Calculate the beta of a firm that goes up on average by 43% when the market goes up and goes down by 17% when the market goes down. b. Calculate the beta of a firm

asked by Anonymous on August 2, 2010
56. ## chemistry

The solubility of the oxidizing agent potassium permanganate is 7.1 g per 100.0 g of water at 25° C. What is the mole fraction of potassium permanganate (KMn04) in this saturated solution? What is the molality of the potassium permanganate solution?

asked by thanh on March 14, 2008
57. ## Chemistry

In the laboratory a student combines 41.7 mL of a 0.386 M iron(III) fluoride solution with 21.3 mL of a 0.616 M iron(III) bromide solution. What is the final concentration of iron(III) cation ?

asked by Anonymous on October 19, 2017
58. ## chemistry

a 10.0mL sample of an unknown H3PO4 solution requirs 112mL of 0.100 M KOH to completely react with the H3PO4. What was the concentrartion of the unknown H3PO4 solution? H3PO4 + 3KOH -----> 3H2O + K3PO4 Ive seen these problems with one volume but not two

asked by Monique on November 3, 2011
59. ## Chemistry

Hi Can someone please help me undersand how to get the answer to this question A 15.0 mL solution of 0.050 mol/L AgNO3 was titrated with 0.0250 mol/L NaBr in the cell SCE || titrated solution | Ag(s) Find the cell voltage for 10.0 mL of titrant added. (a)

asked by James on April 26, 2010
60. ## chemistry

A student weighs out 0.568 g of KHP (molar mass = 204 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton. a. 3.15 M b. 0.0757 M c.

asked by mathew on October 12, 2014
61. ## Chemistry

Please check my work- what is the molarity of a solution that has 34.85 g of Potassium sulfate dissolved in one liter of solution? so K2(SO4) molar mass is 174.26, 34.85 grams x 1mol/174.26 than divided by 1 Liter equals .19998 Molarity with sig figs would

asked by Petey on April 25, 2016
62. ## Electrochemistry

Is it possible to separate platinum, palladium, and iridium as chloro-complex ions from an HCl solution through electrolysis if the solution is a constant 1.0 molarity in chloride ions and 0.020 molarity in each complex ion? The E values for the half

asked by Jeff on December 23, 2018
63. ## Chemistry

What is the final concentration (M) of a solution prepared by diluting 50.0 mL of a 6.00 M KCl solution to a volume of 0.500 L? A. 1.67 B. 0.600 C. 0.0167 D. 3.0 E. none of these My initial thought was to take the 6.00 M KCl/0.500 L, for an answer of 12.

asked by Coug on November 21, 2009

what mass of water must be added to 425 g of formaldehyde to prepare a 40.0% (by mass) solution of formaldehyde? this solution, called formalin, is used to preserve biological specimens. (hint:) substitute the known quantities into the definition for mass

asked by danielle p. on March 4, 2013
65. ## chemistry

Copper(II) chloride and lead(II) nitrate react in aqueous solutions by double replacement. Write the balanced chemical equation, the overall ionic equation, and the net ionic equa- tion for this reaction. If 10.27 g of copper(II) chloride react, what is

asked by jan on February 23, 2014
66. ## Predicting products for electrolysis

when you have your 4 different equations to form 4 different possible equations, what two equations do you use for water, O2(aq) + 4H+ + 4e- ----> 2H20 (+1.23) 02 (g) + 2H2O (l) + 4e- ----> 4OH- (+0.40) 2H20 (l) + 2e- ---> h2 (g) + 2OH- (aq) (-0.83) I'm

asked by Sienna on January 16, 2007
67. ## College Chemistry

A buffer solution contains 0.120M acetic acid and 0.150M sodium acetate. a. How many moles of acetic acid and sodium acetate are present in 50.0 ml of solution? b. if we add 5.55 mL of 0.092M NaOH to the solution in part (a) how many moles of acetic acid ,

asked by Elizabeth on November 10, 2010
68. ## Che

An optically active amino acid (A) can exist in three forms depending on the pH of the medium. If the molecular formula of (A) is C3H7NO2 write (i) structure of compound (A) in aqueous medium. What are such ions called? (ii) In which medium will the

asked by abhi on February 5, 2013
69. ## math help pls pls

Maya had \$27. She spent all the money on buying 3 burgers for \$x each and 2 sandwiches for \$y each. If Maya had bought 2 burgers and 1 sandwich, she would have been left with \$11. A student concluded that the price of each burger is \$5 and the price of

asked by Oscar on December 21, 2015
70. ## Chemistry

Use the data in this table to calculate the solubility of each sparingly soluble substance in its respective solution. (a) silver bromide in 0.066 M NaBr(aq) mol · L-1 I know how to do this one, found it to be 1.167E-11 which is correct. (b) nickel(II)

asked by Val on March 19, 2010
71. ## math

I need to know if I did this right. Below is story problem. It has questions labeled a-f. Under each lettered question, I provided an answer, but I am not confident with my outcome. Can you read it over and tell me if I did it right? If not can you steer

asked by Heather C on November 19, 2009
72. ## Math: Calculus - Vectors

Two forces of 90 N act on an object. The forces make an angle of 48 degrees to each other. Calculate the resultant force and the force that must be applied to the object to create equilibrium. My work, using geometric vectors: | r |^2 = 90^2 + 90^2 -

asked by Anonymous on February 19, 2008
73. ## chemistry

The urine excreted by an adult patient over 24 hours was collected and diluted to give 2.000L sample. at ph 10 EDTA FORMS 1:1 COMPLEX WITH BOTH Mg2+ and Ca2+ and after buffering at this pH a 10mL aliquot of the sample required 26.81mL of 0.003474M EDTA for

asked by TOM on March 12, 2012
74. ## Molecular cell Biology

The following chemicals have the indicated formula weights:Sucrose-342.3,Potassium dihydrogen phosphate(KH2PO40-136.09,Tris -121.14.You also have the following solutions made:20%SDS,5M NaCl,500mM EDTA.You have a 40%glycerol solution and 10X TBE.List the

asked by Caroline on January 18, 2014
75. ## chemistry

A solution containing 5.00g of solid Al2(CO3)3 dissolved in water to a total volume of 200. mL is combined with 140. mL of 1.0 M HBr. Write the total of ionic equation for the reaction described below and find the molar concentration of all ions remaining

asked by SELDIL on April 16, 2012
76. ## chemistry 2

Which property of group 2 elements ( magnesium to barium) and their compounds increases with an increasing proton (atomic) number? A)the magnitude of the enthalpy change of hydration of the metal ion B)the pH of the aqueous chloride C)the solubility of the

asked by areebah on August 31, 2017
77. ## chemistry 2

Which property of group 2 elements ( magnesium to barium) and their compounds increases with an increasing proton (atomic) number? A)the magnitude of the enthalpy change of hydration of the metal ion B)the pH of the aqueous chloride C)the solubility of the

asked by areebah on August 31, 2017
78. ## Chemistry

The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the

asked by Bridget on February 23, 2014
79. ## Chemistry

Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an

asked by Odesa on December 11, 2012
80. ## Chemistry

Consider the gold-platinum system which has a value of delta w of -4250 J/mole; (a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole. (b) Is the dissolution of 10% platinum into gold an

asked by Ling on December 13, 2012
81. ## extraction

How to distingush organic layer and aqueous layer? The organic layer is the one on top. Most organic solvents are less dense than water. (NOte: Non-hydrocarbons such as chloroform, methylene chloride, carbon tetrachloride etc are more dense than water.)

asked by bb on August 21, 2007
82. ## finance

"given the profit loss (income statement) and balance sheet for Sam's sandwich delivery(table 4-8), answer the following: a. calculate the current and quick ratios. b. using the inventory figure on the balance sheet as average inventory, calculate the

asked by Anonymous on May 8, 2010
83. ## Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g) / 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

asked by Brenda on January 25, 2011
84. ## Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance So (J/mol∙K) ∆Hºf (kJ/mol) C2H2(g) 200.9 226.7 H2(g) 130.7 0 C2H6(g) - - -84.7 Bond Bond Energy

asked by Brenda on January 15, 2011
85. ## Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g) / 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

asked by Brenda on January 16, 2011
86. ## Chemistry

C2H2(g) + 2 H2(g)--> C2H6(g) Information about the substances involved in the reaction represented above is summarized in the following tables. Substance/ So (J/mol∙K) /∆Hºf (kJ/mol) C2H2(g) / 200.9 / 226.7 H2(g)/ 130.7 / 0 C2H6(g)/ ?? / -84.7 Bond

asked by Brenda on January 15, 2011
87. ## Chemistry-Is this correct?

The concentration of NaOH is normally in the range of 3-6 M when they peel potatoes and soak them in a solution of NaOH , remove them and spray them off. If I have 45.7 mL of 0.500M of H2SO4 required to react completely with a 20.0 mL sample of NaOh. What

asked by Sara on May 20, 2010
88. ## Chemistry

Calculate the expected freezing point of a solution of 0.579 g pelargonic acid in 4.225 g of lauric acid, if the melting point of pure lauric acid was measured to be 43.20*C. (MM pelargonic acid = 158.2 g/mol; MM laruic acid = 200.32 g/mol). Kf for lauric

asked by Amanda on February 11, 2017
89. ## Chemistry

hellppp please i have a test on this on mondayy im so screwed A solid mixture contains MgCl2 and NaCl. When 0.5000 g of this solid is dissolved in enough water to form 1.000 L of solution, the osmotic pressure at 25°C is observed to be 0.4010 atm. What is

asked by yvonne on November 29, 2008
90. ## physics

A Syringe is filled with a solution of viscosity n=1.75x10^-3 pa s. The plunger of syringe has cross sectional area 9 x 10^-5 m^2. The needle has length 30mm and internal radius 3 x 10^-4 m. Intravenous pressure in patient is 2.0 kPa. What force must be

asked by Hannah on December 6, 2016
91. ## chemistry

a solution of kcl contains 10. grams of kcl in 100. ml of water at 30c. how many additional grams of kcl are needed to saturate the solution?

asked by :)) on April 11, 2015
92. ## chemistry

A buffer solution contains 0.200 M NH3 and 0.250 M NH4Cl. What is the pH of the buffer solution after the addition of 10.0 mL of 0.100 M NaOH to 50.0 mL of the buffer? Kb for NH3 is 1.8 x 10-5.

asked by Brett on October 26, 2010
93. ## Algebra 1

Thank you in advance for your kind help! How much fresh water should be mixed to a 30% salt water solution, to obtain 90 gallons of a 23% salt water solution?

asked by Matt on May 4, 2016
94. ## Algebra 1

Thank you in advance for your kind help! How much fresh water should be mixed to a 30% salt water solution, to obtain 90 gallons of a 23% salt water solution?

asked by Matt on May 4, 2016
95. ## biology

another way to afect the enzyme is lowering the pH of the solution. However, lactase is supposed to be able to work in the stomack. Would lowering the pH of the enzyme solution affect the enzyme? Why or why not?

asked by sara on November 11, 2011
96. ## chemistry

You need 715 mL of a 45% alcohol solution. On hand, you have a 55% alcohol mixture. How much of the 55% alcohol mixture and pure water will you need to obtain the desired solution?

asked by Gotti on October 18, 2014
97. ## College Chemistry

I DO NOT understand the following! Please HELP :) 1st Part Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is yellow, and C is red. In the reactions in which they participate, they are reduced to A-, B-, and C- ions, all

asked by Lisa on November 10, 2010
98. ## AP Chemistry

From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest

asked by Anonymous on November 24, 2010
99. ## science

From the following: pure water solution of C12H22O11 (m=0.01) in water solution of NaCl (m=0.01) in water solution of CaCl2 (m=0.01) in water choose the one with the a) highest freezing point b) lowest freezing point c) highest boiling point d) lowest

asked by Sal on October 5, 2010
100. ## Chemistry

If 4.0 L of a 4.8 M SrCl2 solution is diluted to 50 L , what is the molarity of the diluted solution?

asked by Lisa on November 1, 2010