Thursday

December 18, 2014

December 18, 2014

Number of results: 61,897

**Maths**

Find the particular solution of the differential equation from: dy/dx = 2/27(x-3)(x^2-6x+23) / (y) (y>0. For which y=2 when x =1, and then give this particular solution in explicit form. regards Claire
*April 6, 2011 by Claire*

**chemistry**

A saline solution was prepared by dissolving 5.45 g sodium chloride to 96.77 g water. What is the concentration in weight percent for this saline solution?
*May 18, 2011 by James*

**Chemistry**

You have a stock solution of 15.8 M NH3 . How many milliliters of this solution should you dilute to make 1350 mL of 0.300 M NH3
*September 13, 2011 by Jennie*

**chemistry**

A 5.00 % m/m glucose solution has d = 1.02 g/mL. What is the mass of glucose in 375 mL of the solution? Enter only the numeric value for your answer (no units).
*September 20, 2011 by Anonymous*

**chemistry**

It takes 75 mL of 0.124 M KOH to neutralize 28.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in moles/liter.
*October 1, 2011 by matt*

**Chemistry**

A solution is prepared by dissolving NH3(g) in water according to the following equation. NH3(g) + H2O(l)=NH4^+(aq)+ OH^-(aq) If the pH= 9.60 what is the [OH-] in the solution.
*November 30, 2011 by Julia*

**chemistry**

a gas solution contains 5 moles H2 and 10 moles of oxygen. what is the mole fraction of hydrogen and oxygenin the solution formed?
*December 13, 2011 by chrisabel*

**chemistry**

An HNO3 solution has a pH of 3.04. What volume of 0.015 M LiOH will be required to titrate 89.0 mL of the HNO3 solution to reach the equivalence point?
*January 5, 2012 by Anonymous*

**Chemistry**

Predict the products when a chemist mixes an aqueous sodium chloride solution with an aqueous calcium nitrate solution.
*March 14, 2012 by Ashley*

**chemistry**

a solution has gluten concentration of 2000ug/mL at 150uL. if 2uLof that solution is taken out what is the quantity of gluten in ppm?
*March 22, 2012 by ms*

**Chem 1**

consider 400 mL of a0.266 M LiNO3 solution. To what volume must it be diluted to make a 0.075 M LiNO3 solution.
*May 2, 2012 by jenni*

**chemistry laboratory**

1. prepare a buffer solution by using acetic acid and sodium acetate.2. prepare M/40 NAOH solution.
*May 31, 2012 by suchismita mandal*

**Chemistry**

2S2O3 2- + I2 => S4o6 2- + 2I - If,in an experiment,0.05 mol S2O3 2- is consumed in 1.0L of solution each second,at what rates are S4O6 2- and I- produced in this solution?
*June 6, 2012 by Yeneta*

**Algebra 1**

Use the multiplication property of inequalities to solve the inequality. Graph the solution set -1/9t≥2 The solution set is?
*August 10, 2012 by Tammie*

**Chemistry**

What determines whether or not the majority of acid is in the protonated form in solution? How does this incorporate both the pH of the solution and the pka of the acid?
*October 30, 2012 by Cristian*

**Chemistry105**

What is the molarity of a solution made by diluting exactely 10.00 mL of a 0.1235 M solution of KNO3 to exactely 250 mL in a graduated flask?
*November 25, 2012 by Mira*

**calculus**

solve the following exponential equation. 8^x=3 what is the exact answer? a. x= ? b. there is no solution what is the answer approximated to 3 decimal places? a. x= ? b. there is no solution
*January 1, 2013 by Kyrstal*

**chemistry**

A solution contains 0.02755 g of a protein in 25.0 mL of solution. The osmotic pressure is 3.22 torr at 298 K. What is the molecular weight of the protein?
*February 17, 2013 by m*

**Chemistry**

A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...
*March 14, 2013 by Maddie*

**Chemistry**

What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?
*March 14, 2013 by Brian*

**Chemistry**

Na2SO4 solution is slowly added to a solution which contains .10 M Ba (2+) and .1 M Pb(2+). which of the following statements descrives the result of the addition of Na2SO4
*April 1, 2013 by Joe*

**Alg 1**

Find the exact solution for each equaton. Find the approximate solution to the nearest tenth. 3 sq rt 3/sq rt 1 + sq rt 1 = x/sq rt 3 Please solve and explain. Thanks
*April 3, 2013 by Jane*

**Chemistry**

Which is the more concentrated solution: a solution made with .70 moles of NaCl in a .35L water or a 35g of NaCl in .75L?
*April 8, 2013 by Alexis*

**Chemistry**

To what volume should you dilute 55mL mL of a 13M M stock HNO 3 solution to obtain a 0.140M M HNO 3 solution?
*August 4, 2013 by Anonymous*

**Chemistry**

To what volume should you dilute 55mL mL of a 13M stock HNO 3 solution to obtain a 0.140M M HNO 3 solution?
*August 4, 2013 by Anonymous*

**chem**

If a 30.00mL aliquot of a 0.15 M NH4Cl solution is added to 20.00mL of a 0.18 M NH4NO3 solution, what is the concentration of nitrate ion in the mixture?
*August 12, 2013 by RC*

**Chemistry**

A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?
*November 9, 2013 by Lori*

**help with math!!!!**

Solve each system using substitution. Tell whether the system has one solution, infinitely many solutions, or no solution. 13. -x + y = -13 3x - 1 = 19 15. 1/3y= 7/3 x + 5/3 x - 3y = 5 17. 3x + y = -13 -2x + 5y = -54
*March 12, 2014 by Hannah*

**SEATTLE**

Determine the volume of base ml needed to prepare the following 500 ml of 0.18 % NaOH SOLUTION USING A 10.0 % NaOH SOLUTION
*March 21, 2014 by MH*

**Chemistry**

A 5.0−L sample of a 5.4M NaCl solution is diluted to 70L . What is the molarity of the diluted solution? How would you set this up and answer it?
*May 1, 2014 by AF*

**Science**

A solution made up of 20ml of mythl alcohol and 50ml of water. What is the volume percent of ethyl alcohol in solution.
*July 7, 2014 by Araceli*

**chemistry/math**

5.0 moles of solid sodium chloride (NaCl) are used to prepare a 5.0 M NaCl solution. What is the volume of the solution?
*October 13, 2014 by Morgan *

**Chemistry**

What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.010 M CH3CO2Na? Assume the volumes of the solution are additive and that Ka = 1.8 x 10-5 for CH3CO2H. 4. How is this solved?
*November 4, 2014 by KJ*

**Chemistry **

what is the molar concentration of h2so4 solution is 2.0ml of which is completely neutralized by 45.0ml of 0.115 mol/L NaOH solution?
*December 1, 2014 by Kathy*

**Chemistry**

calculate the enthalpy change in delta H foor heating 250 grams of liquid water from 0 degrees celcius to 100 degrees celcius.
*February 11, 2011 by Bri*

**chemistry**

If you know that the mass concentration of a NaCl solution is 58.5 g/L, the molar concentration (mol/L) of the solution is ? can sum1 help me plz 1 mol of NaCl has a mass of what? 58.5 g NaCl x (1 mol NaCl/molar mass NaCl) = mols NaCl on 58.5 gg NaCl. Mols NaCl/Liter of ...
*June 13, 2006 by brett*

**math**

The scientists Verhulst (1828) and Peal (1930) proposed the following growth model for a population living in an environment with limited resources (e.g. space, food, sunlight, etc): = , where is the natural growth rate of the population when resources are limited and is a ...
*November 6, 2008 by josh*

**chemistry**

A) If you make up a solution of 50 mL of 0.1 M TRIS in the acid form, what will be the pH? (pka of TRIS: 8.3, molecular wt: 121.1 g) B) if you add 2mL of 1 M NaOH to the solution, what will be the pH? Thank you.
*February 2, 2008 by matt*

**college gen chem**

A quantity of 16.13 mL of a KOH solution is needed to neutralize 0.4883 g of KHP. What is the concentration (in molarity) of the KOH solution?
*March 2, 2009 by han*

**math**

A linear system may have a unique solution, no solution, or infinitely many solutions. Indicate the type of the system for th following examples by U , N , or I 7x+3y= pi 4x-6y= pi^2 2x+3y= 0 4x+6y= 0 2x+3y=1 4x+ 6y= 1 x+y=5 x+2y=10 2x-3y=5 4x-6y=10
*September 10, 2009 by Completely lost?!*

**chemistry**

A SOLUTION OF 0.05METER ACID PKA 6.10 IS MIXED WITH AN EQUAL VALUE 0.1 SODIUM SOLUTION OF SODIUM SALT WHAT IS THE PH OF THE FINAL MIXTURE.
*March 30, 2010 by ronke*

**Chemistry**

if an aqueous solution of BA(NO3)2 is added to 1.0 L of a solution containing 0.05 mol F- and 0.075 mol SO4 2-, which salt will precipitate first?
*April 26, 2010 by Matt*

**Algebra 1a**

Solve the following system of equations. x+3y=6 x=8-3y What is the solution of the system? Type the ordered pair or indicate if there is no solution. Thank you very much
*May 26, 2010 by Nikki*

**Chemistry**

It takes 56 mL of 0.124 M KOH to neutralize 45.4 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in units of moles/liter
*September 23, 2010 by Cheyenne*

**Chem 2068 lab**

Once I have the molarity for KHP which is 0.0027 M, and i add 14.48 mL of NaOH to the solution, what is the concentration of NaOH in the solution.
*October 18, 2010 by Car*

**chemistry**

describe how would you prepare exactly 500. ml of 1.0 M NaOH solution from a 3.0 stock NaOH solution . show all calculation
*October 30, 2010 by hadil*

**Chemistry**

A 327- ML sample of unknown HCI solution reacts completely with Na2CO3 to form 20.1 g CO2 What was the concentration of the HCI solution?
*November 30, 2010 by Cathy Miller*

**Chemistry**

72.0 ml of a 1.50 M solution is diluted to a volume of 288 mL. A 144 mL portion of that solution is diluted using 185 mL of water. What is the final concentration?
*January 24, 2011 by Anonymous*

**Chemistry**

72.0 ml of a 1.50 M solution is diluted to a volume of 288 mL. A 144 mL portion of that solution is diluted using 185 mL of water. What is the final concentration?
*January 25, 2011 by Anonymous*

**Chemistry**

What is the molarity of CuCl2 solution that completely reacts with 10.0g of zinc , if the volume of the solution is 360mls? Zn(s) + CuCl2(aq) ZnCl2(aq) + Cu(s) A. 0.42 B. 0.00021 C. 0.21 D. none of these
*March 5, 2011 by Tim*

**chemistry**

What concentration of ammonia, [NH3], should be present in a solution with [NH4+]= 0.734M to produce a buffer solution with pH= 9.13? For NH3, Kb= 1.8x10^-5
*April 13, 2011 by rooftops*

**Chemistry**

Will a double replacement reaction take place if a solution of sodium hyrdrogen carbonate is added to a solution of sodium chloride?
*April 21, 2011 by Jes*

**chemistry**

Determine the Molarity of a 125 mL NaOH solution if upon titration with 5.5 mL of an 2.5 M HCl solution, the end point of the titration was reached
*June 15, 2011 by liz*

**A/P Chem**

A student wants to make a 5.00% solution of potassium chloride using .0377 g of the substance.What mass of water will be needed to make the solution?
*July 24, 2011 by Autum*

**AP Chem**

It takes 58 mL of 0.124 M KOH to neutralize 34.5 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in unites of moles/liter.
*September 11, 2011 by Chandler*

**chemistry**

A solution contain 43mEq/L of Cl- and 11 mEq/L of HPO4*2-. If the only cation in the solution is Na+ what is the Na+ concentration if mEq/L? Can you help me with each step to solve this problem?
*October 14, 2011 by Connie*

**Chemistry**

A stock solution is prepared by adding 20mL of 0.2M MgF2 to enough water to make 80mL. What is the F concentration of 20 mL of the stock solution?
*November 3, 2011 by aDRIAN*

**chemistry**

If 215.0 mL of water are added to a 237 mL sample of a 1.702 M dextrose solution, what is the new molarity of dextrose in the resulting solution?
*December 2, 2011 by B*

**applied chemistry**

A 50.0mL volume of AgNO3, solution contains 0.0285 mol AgNO3 (SILVER NITRATE). What is the molarity of the solution?
*March 7, 2012 by jose*

**finite math**

Determine whether each system of linear equations has a)one and only one solution, b)infinitely many solutions, or c) no solution 2x-4y=5 3x +2y=6
*April 3, 2012 by bob*

**chemisttry**

how many ml of a 1 M NaOH solution do you need to add to a 250 ml flask and bring it to volume with deionized water to make a 0.12 M NaOH solution
*April 23, 2012 by william*

**MATH**

A provider orders 90 ml of a 2.5% mannitol solution. How much of a 25% mannitol solution should be added to water to achieve the appropriate strength?
*July 6, 2012 by Niricoel*

**chemistry**

What volume of a concentrated hcl solution which is 36% by mass and has a density of 1.179 g/ml to make 4.85L of an hcl solution with ph of 1.9? Who helps me to solve it for me.
*August 4, 2012 by Fai*

**Chemistry**

75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
*August 26, 2012 by Amanda*

**Chemistry**

75.0 mL of a 1.80 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 187 mL of water. What is the final concentration?
*August 26, 2012 by Amanda*

**chemistry**

It takes 62 mL of 0.124 M KOH to neutralize 46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in units of moles/liter
*September 13, 2012 by cheri*

**chemistry**

It takes 62 mL of 0.124 M KOH to neutralize 46.7 mL of H2SO4 solution. What is the concentration of the H2SO4 solution? Answer in units of moles/liter
*September 16, 2012 by cheri*

**Chemistry**

67.0 mL of a 1.50 M solution is diluted to a volume of 258 mL. A 129-mL portion of that solution is diluted using 163 mL of water. What is the final concentration?
*October 2, 2012 by Anonymous*

**Chemistry 103**

To what volume should you dilute 50ml of a 13M stock HNO3 solution to obtain a 0.131M HNO3 solution?
*October 7, 2012 by YeJi*

**Chemistry**

How many milliliters of a 0.20 M of glucose (C6H12O6) solution are needed to provide a total of 25.0 g. of glucose? Molarity(M)= Moles of Solute/Liters of Solution
*November 11, 2012 by Melia*

**chemistry**

How would student make 500mL of .08500 M solution of iron using stock solution of .3180 M in iron(III)?
*November 27, 2012 by zale*

**chemistry**

If you made up a solution of NaOH by adding 0.010 mole of solid NaOH to 1.0 liter of distilled water, what would be the pH of the solution?
*December 18, 2012 by Monica*

**Chemisty**

74.0 mL of a 1.80 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 135 mL of water. What is the final concentration?
*January 14, 2013 by Paul*

**chemistry**

anyone help me . .what volume of concentrated HCL solution whoch is 36% by mass and has a density of 1.179 g/ml , should be used to make 4.7 L of hcl solution with a pH of 1.8 ?
*February 13, 2013 by m*

**GEN CHEM**

A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?
*March 3, 2013 by KRIS*

**Chemistry **

the hydronium ion concentration of a 0.050 M solution of a weak acid is 5.9 X 10^-3 M. the acid-dissociation constant is 1.37 X 10^-4 at 25 celsius. what is the pH of this solution? A. 0.077 B. 1.30 C. 2.23 D. 3.86 E. 5.13
*March 18, 2013 by Chemistry*

**chemistry**

A 337-\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 17.1g \rm CO_2. What was the concentration of the \rm HCl solution?
*April 7, 2013 by Lauren*

**chemistry**

a 35.0ml sample of 37 hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013 by john*

**chemistry**

a 35.0ml sample of 37% hcl solution has a density of 1.18g/ml. the sample is diluted to a volume of 0.125L. what is the molarity of the final solution ?
*May 5, 2013 by john*

**Chemistry**

How much cm3 solution of concentrated ammonia with 25% density of 0.91g/cm3 should be added to 7 g NH4Cl so we can get a solution of 100cm3 with pH 10 (Kb = 1.8 x 10-5)
*June 11, 2013 by HelpPls*

**Chemistry**

Hard ball candy is prepared from boiling an aqueous sugar solution that has a boiling point of 260.F. What is the molality of this solution?
*September 11, 2013 by Jade*

**Chemistry**

A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.
*November 12, 2013 by Olivia*

**math**

The equation: T= 2* pi* sqrt(2/3L/9.8) Solve for L. Please show the solution step by step. The square root is giving me trouble in my solution. Thanks for your help.
*January 1, 2014 by alice*

**College Algebra**

Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?
*March 17, 2014 by Cassandra*

**pre algebra**

Check whether (-4, -12) is a solution of the system of equations. y = 6x + 12 2x - y = 4 When the graphs of two equations are parallel, there are infinitely many solutions. y = x + 4 y = 3x solution: ( , )
*April 11, 2014 by berta*

**Chemistry**

A 495-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1g CO2. What was the concentration of the HCl solution?
*May 5, 2014 by Jenn*

**algebra**

A lab assistant wants to make 5 liters of 27.2% acid solution. If solutions of 30% and 16% are in stock, how many liters of each must be mixed to prepare the solution?
*July 5, 2014 by annie*

**Chemistry**

To make 1.5 L of 0.1 M NaCl from a 2.52 M stock solution, you would need to take ____ mL of the stock solution and add _____ mL of water.
*October 1, 2014 by aaa*

**Chemistry**

75.0 mL of a 1.40 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 165 mL of water. What is the final concentration?
*November 29, 2014 by jessica*

**Math check**

Decide whether each equation has one, no solutions, or infanatly many solutions 1.) 2(x - 3) = 2x One solution no solutions many solutions infinatly many solutions 2.) 3(y - 3?) = 2y - 9 + y One solution no solutions many solutions infinatly many solutions 3.)10x - 2 - 6x = 3x...
*January 8, 2014 by Josh*

**chemistry**

A quantity of 12.75 mL of a KOH solution is needed to neutralize 0.5109 g of KHP. What is the concentration (in molarity) of the KOH solution?
*March 3, 2011 by Alex*

**math**

The IV dose of mannitol is 1.5g/kg, administered as a 15% solution. How many mls of the solution should be administered to a 150 pound patient?
*March 9, 2008 by melissa*

**Math 116 algebra please check**

Solve the following system of equations x + 6y =4(1) x = 9-6y (2) What is the solution of the system N There is no solution
*July 16, 2008 by jay jay*

**chemistry**

Ammonia acts as a base in aqueous solution; Kb is equal to 1.8 x 10-5. What is the Ka for the ammonium ion NH4+ in aqueous solution?
*October 31, 2008 by Megan*

**chemistry**

A dilute sulfuric acid solution that is 3.39 molality H2SO4 has a density of 1.18 g/mL. How many moles of H2SO4 are there in 375 mL of this solution?
*February 23, 2010 by Nick*

**chemistry**

The molarity of urea in a solution prepared by dissolving 16 g of urea (MW 60.0g/mol) in 39 g of H2O is ______M. The density of the solution is 1.3 g/ml.
*March 9, 2010 by CC*

**algebra**

Solve each inequality. State the solution set using interval notation and graph the solution set. 1-x<6 or -5+x<1
*April 6, 2010 by Marsha*

**math**

is each ordered pair a solution of the given system? write yes or no. 1. y=6x+12 2x-y=4 (-4, -12) 2. Y= -3x x=4y+1/2 (-1/2,3/2) 3.x+2y=2 2x+5y=2 (6,-2) 4. Solve the system by graphing. Check your solution. x + y=3 x - y=-1
*April 25, 2010 by Anonymous*

**chemistry**

A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.9 10-11 for Mg(OH)2 and Ksp = 6.0 10-26 for Sn(OH)2.
*April 27, 2010 by Anonymous*

**Math**

The following equation has a positive and a negative solution. z-1/z+1 = 2/z+4 I need to find the positive solution, any ideas please?
*August 14, 2010 by Del*

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