# 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 283-
## Math/Physics

A race horse starts from rest with an acceleration of 4.80m/s^2 1. How long does it take for the horse to reach a velocity of 32.0m/s? 2. Calculate the displacement of the horse

*asked by katieee on October 16, 2018* -
## chemistry

i am doing problems for chemistry class, and some of them are Calculating square root/ Cube Root but some are 4 and 5 instead of 2 or 3. if in a problem the exponent is 4 or 5 how would i use my calculator to calculate the root?

*asked by jack on November 27, 2010* -
## math

three towns A,B,C are situated such that AB is equal to 60km and AC is 100km.The bearing of C from A is 290degree and the bearing of B from A is 060 degree calculate a)the distance BC b)the bearing of B from C

*asked by fredrick on January 20, 2016* -
## Math check

Average cost = q^2¡V15q + 48 Calculate the output level (q), which minimizes a)Total Cost b)Marginal Cost I got an answer for a) is q=8 and b) is q=5 I need somebody to check it for me, thanks so much.

*asked by yan on January 17, 2007* -
## chemistry

What equation will you use to calculate the heat of fusion of ice? The specific heat of water is 4.184 J/(gx°C), and the heat capacity of your calorimeter is 1.0x10^1 J/°C.

*asked by Stephanie on October 1, 2013* -
## Chemistry

The equilibrium constant for the reaction H2 + I2 --> 2HI, is 54 at 425 degrees C. If the equilibrium mixture contains 0.030 M HI and 0.015 M I2, calculate the equilibrium concentration of H2.

*asked by Hannah on November 24, 2014* -
## ap chemistry

a cell is based on the following reaction Fe(s)+2Fe+3(aq) -----> 3Fe+2 (aq) E cell= 1.18 V. Calculate the concentration of iron (II), in M, if the cell emf is 1.28 V. when [Fe^(3+)]= 0.5 M the answer is 0.047 M

*asked by Anonymous on May 25, 2015* -
## maths

mr williams bought a plot of land for $40000. the vale of the land appreciated by 7% each year. calculate the value of the land after a period of two years.

*asked by jamila on April 7, 2012* -
## chemistry

calculate the mass percent of the following solutions 1.25 g CaCL2 in 35.0 g H2O I am not sure if i have the correct set up (1.25g CaCl2/1.25 g CaCl2 + 35.0 g H20)*100

*asked by ashley on May 14, 2014* -
## Maths

a tray holds 2.3 liters of water when full (2300 cm3) Calculate the height (h cm) of the tray Tray = L=15cm B=20cm H=?

*asked by Maths on June 14, 2009* -
## chemistry

Calculate each of these equilibrium concentrations based on the reaction below. 2 NO(g) + O2(g) 2 NO2(g) K = 1.71 1012 (a) [NO] = 0.0048 M; [O2] = 0.000057 M; [NO2] = ? (b) [NO] = 0.0026 M; [O2] = 0.000023 M; [NO2] = ?

*asked by Anonymous on September 12, 2011* -
## chem 1

A gas-forming reaction produces 1.35 m3 of gas against a constant pressure of 143.0 kPa. Calculate the work done by the gas in joules.

*asked by christie on May 2, 2013* -
## physics

a particle is projected at an angle of 30 degree to the horizontal. (a), calculate the time of flight of the particle. (b) speed of the particle at its maximum height

*asked by bassey on August 18, 2014* -
## chemistry

N2(g)+H2(g)-NH3(g) Calculate the volume of ammonia gas produced when20cm3 of nitrogen gas was reacted with an excess of hydrogen gas

*asked by kate on March 25, 2013* -
## chemistry

Calculate each of these equilibrium concentrations based on the reaction below. 2 NO(g) + O2(g) 2 NO2(g) K = 1.71 1012 (a) [NO] = 0.0048 M; [O2] = 0.000057 M; [NO2] = ? (b) [NO] = 0.0026 M; [O2] = 0.000023 M; [NO2] = ?

*asked by Anonymous on September 12, 2011* -
## maths

At an ice hockey match 3/5 of the spectators were boys and 1/10 were girls. The remainder of the spectators were adults. Calculate the fraction of the spectators who were children?

*asked by rebecca on February 20, 2011* -
## Chemistry

Calculate volume of ammonia gas produced at STP when 140g of nitrogen gas is reacted with 30g of hydrogen gas.

*asked by Nasreena on September 27, 2016* -
## Hyde memorial secondry school

A pole 6m long leans against a vertical wall so that it makes an angle of 60 with the wall calculate the distance of the foot of the ladder from the wall.

*asked by Shedrack Danjuma on November 25, 2012* -
## physics

A shot-putter throws the shot with an initial speed of 4.0 m/s from a height of 4.7 ft above the ground. Calculate the range of the shot for each of the following launch angles.

*asked by Anonymous on October 21, 2011* -
## physics

A 100 g blob is attached to avertical spring and the spring stretched 4 cm from its original length..calculate the spring constan, k and period, t

*asked by farid on December 27, 2013* -
## physics

A force 457 Newtons causes a displacement 6.2 metres which is at an angle of 8 degrees to the direction of the force vector. Calculate the work done by the force.

*asked by jake on May 26, 2014* -
## chem

Calculate the specific heat (\rm{J/g \; ^\circ C}) for a 21.5 g sample of a metal that absorbs 685 J when temperature increases from 42.1^\circ C to83.2^\circ C

*asked by HUYGEn on December 12, 2012* -
## physics

A 100 g blob is attached to a vertical spring and the spring stretched 4 cm from its original length.calculate the spring constant, k and period, t

*asked by farid on December 27, 2013* -
## Physics

A ball is thrown horizontally at 18m/s from the roof of a building lands 28metre from the base of the building. Calculate the height of the building.

*asked by Sarah on January 18, 2018* -
## chemistry

Welders often use acetylene torches heat up the metal. The reaction is: C2H2(g) + 2.5O2(g) = 2CO2(g) + H2O(g) Calculate the ΔH of reaction for this reaction.

*asked by danny 16 on January 31, 2015* -
## Math

A road runs along the south boundary of the SW 1/4 of the SW 1/4 of a section. If the road contains two acres in the area, the width of the road would be: The answer is 66 feet, but I can't calculate it.

*asked by William on February 25, 2016* -
## Physics

An ideal spring has the spring constant k = 414 N/m. Calculate the distance this spring must be stretched from its equilibrium position for 22 J of work to be done in meters.

*asked by James on May 27, 2012* -
## physics

The efficiency of a machine is 75%.If this machine raises a load of 150kg through a vertical height of 20cm,Calculate the workdone by labourer using the machine

*asked by Taiwo on August 16, 2018* -
## Chemistry

2. what solution can you add to each of the following cation mixtures to precipitate one cation while keeping the other cation in sloution? write complete and net ionic equations for thr precipitation reactons that occur. a) sr+2 (aq) anf Hg+2 (aq) b) ca+2

*asked by Alexandria on April 28, 2011* -
## Chemistry

pH pH ( strip c : 8 ) dark green pH ( strip d : 3 ) purple - suppose u mix togather equal amounts of the solutions that produced the results of strip c and d , then test the pH of this new solution. What color will the indicator paper be? Explain .

*asked by Ruby on February 24, 2013* -
## Chemistry

Potassium permanganate (KMnO4) solutions are used for the determination of iron in samples of unknown concentration. As a laboratory assistant, you are supposed to prepare 700. mL of a 0.200 M KMnO4 solution. What mass of KMnO4, in grams, do you need?

*asked by Mark on March 9, 2014* -
## chemistry

Iron-59 has a half-life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Show all calculations leading to a solution. Is this how you would do this? (100/25) = 0.693 times (45.1) 4= 31.2543 final answer is

*asked by Student101 on May 11, 2015* -
## chemistry

An acid HA has Ka = 2.28 x 10 -4. The % ionisation of this acid in a 0.170 M solution of the acid in water is closest to 3.662 % 0.623 % 0.498 % 2.930 % 0.436 % 2.564 % i have an exam in 1 week and these are the types of questions i don't understand

*asked by Lucinda on May 27, 2010* -
## Math (Algebra)

The width of a rectangle is fixed at 7cm. Determine (in terms of an inequality) those lenghts for which the area will be less than 161cm squared. The length must be less than ? cm. (simplify your answer) The solution is {L l L < ? cm.} (simplify your

*asked by Lola on September 24, 2009* -
## algerbra 1

The decimal notation for the fraction -9/16 is Round to the nearest hundreth Solve 5x+8x=78 The solution is x= Simplify the answer. Type an integer of decimal. Solve using the addition principle 9.5=p-9.2 The soluation is p=

*asked by Connie on November 16, 2011* -
## chemistry

A 0.1 molal solution of a weak monoprotic acid was found to depress the freezing point of water 0.1930C. Determine the Ka of the acid. You can assume 0.1 molal and 0.1 molar are equivalent.

*asked by ashley on February 12, 2012* -
## Chemistry 2 Ap

Can someone please help me ? What mass of glycerol must be dissolved in 200.0 g of water to give a solution with a freezing point of -1.50? im not sure how to even start this problem. I think i would find the moles in water first, then the grams in

*asked by jecce. on February 10, 2009* -
## chemistry

Explain the following statement. A saturated solution contains a mixture of silver chloride, AgCl and silver carbonate, Ag2CO3. An addition of hydrocloric acid will decrease the solubility of AgCl

*asked by oliver on January 3, 2016* -
## Chemistry

When 0.855 g of this solid was dissolved in 7.50 g of napthalene, the solution had a freezing point of 78.0° C. The pure solvent freezes at 80.0° C; its molal freezing point constant is 6.8° C/m. What is the molecular formula of the compound?

*asked by Justyn on January 17, 2011* -
## Chemistry

A solution is made by mixing 35.0 mL of toluene C6H5CH3d=0867gmL with 125.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are

*asked by Jay on August 2, 2009* -
## Chemistry - Van't Hoff Factor

How do I determine the van't hoff factor for a strong unknown electrolyte? I have the freezing point depression, (0.46 C) and there 18 ml of the unknown solution. I know the formula is T=iKfm, but I don't know how to apply it when I don't know m.

*asked by Allison on September 12, 2017* -
## Chemistry

Hello, I was wondering what would happen if u add KOH(potassium hydroxide) solution instead of KOH solid to HCL (hydrochloric acid). Currently, learning enthalpy in class and I'm not sure how this affects enthalpy

*asked by Ann on December 12, 2016* -
## Molarity

Find the molarity of a salt water solution containing 0.27 mol NaCl in 150g of H2O. My work: 0.27 mol NaCl/150 g x 1000g/1kg = 1.8 M is this correct, i wasn't really sure what to do...

*asked by Janice on November 12, 2009* -
## chemistry

A solution is made by mixing 25.0 mL of toluene C6H5CH3d=0867gmL with 135.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are ?

*asked by dude on June 25, 2010* -
## ap chemistry

BaO2(s) + 2 HCl(aq) H2O2(aq) + BaCl2(aq) What amount of hydrogen peroxide should result when 1.00 g of barium peroxide is treated with 15 mL of hydrochloric acid solution containing 0.0330 g of HCl per mL? So confused... >.

*asked by Kris on August 1, 2013* -
## Chemsitry

What is the pH of the buffer solution that results when 58.50 g of sodium acetate (NaCH3CO2) (Formula Mass = 82.02 g mol-1) is added to 1 litre of 0.45 mol L-1 acetic acid (CH3CO2H) ? Data: Ka for CH3CO2H = 1.8 x 10-5

*asked by Sue on April 20, 2015* -
## Chemistry

I know I am over thinking this problem like always but none of this makes sense to me for some reason.. KHP was used to determine the concentration of a KOH solution. If 0.78g of KHPwas used and 42.17 ml of KOH was used to titrate it to the endpoint what's

*asked by Mara on May 21, 2017* -
## chemistry

what is ph during titration of 10.00ml of 0.1000m triethylamine, ch3ch2)3n (kb=2.3x10^-, with 0.1000m HCL solution after addition of titrant (HCL) 1, 0ml, 5ml,10ml, 20ml,30ml

*asked by ette on October 14, 2011* -
## psychology

I need help bascially i didn't have time to jot down the homework so i'm not sure what the homework is about so...the only solution to this is to email my teacher but i don't know how to say it to her? Shall i say to her hello, I'm not sure what to do for

*asked by help on September 28, 2017* -
## english

Instead of being the solution to larger issues like low self-esteem and depression, cosmetic surgery has become the issue." This is my theis, can I please get some help with supportive information to support my thesis. This paper is for cosmetic surgery.

*asked by Goldie on April 29, 2010* -
## Chemistry

How much concentrated solution would you take to prepare 2.80L of 0.475M HCl by mixing with water? Hydrochloric acid is usually purchased in a concentrated form that is 37.0% HCl by mass and has a density of 1.20g/mL.

*asked by M J on February 21, 2013* -
## chemistry (Pls Bob check for me)

what mass of 25% ba(n03)2 solution contain 40 grams of ba(n03)2 ? Answer 160g My calculation 40g/261.37g/mol = 0.15305/0.25g = 0.612 This answer is not right Who helps

*asked by Fai on April 28, 2013* -
## Math

help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx - 2x^(2) dy = 0 ;y = e, x

*asked by Huck on October 18, 2009* -
## Chemistry

What is the pH of a solution made up of 50cm^3 of 1M Ethanoic Acid and 25cm^3 of 1M sodium ethanoate? Assume Ka for Ethanoic acid is 1.8 x 10^-5 mol dm^-3 I'm not quite sure how to do this. I was going to use the equation pH = pKa + log[A-]/[HA] but it

*asked by Alice on February 16, 2009* -
## Chemm

Find the OH- concentration of a solution that is 0.198 M NaOH and 0.262M NH4Cl. I did the ice table,using OH- from NaOH for an initial, and NH4 from the NH4Cl molecule, and ended with .20M. But that's not right apparently...

*asked by Rick on November 14, 2011* -
## high school chem

If 250ml of Ba(OH)2 is unknown concerntration with methyl red indicator present is tritrated with [0.325M]HNO3, the yellow solution turns red after 36.4 ml of the HNO3 is added. What is the molarity of Ba(OH)2

*asked by jessica on June 1, 2010* -
## Chemistry

A. Ionic solid B. Molecular solid C. Covalent solid D. Graphic solid Which of this solids is soluble in water, conductive in solution, brittle and could have a melting point of 2800 C. I think the answer is A.

*asked by Morgan on December 16, 2014* -
## Chemistry

A 5g mn sample was dissolved in 100ml water. If the percentage of M (At wt =55g/mol) in the sample is about 5%. What volume is needed to prepare 100ml of approximately 3.0 x 10-3 M solution Who helps for me. The right answer 6.7ml

*asked by Fai on November 4, 2012* -
## Algebra 1

What is the solution of this question. You are taking a science course in which there will be four tests, each worth 100 points. You have scores of 88, 88, and 98 on the first three tests. You must make a total of 360 in order to get an A. What scores on

*asked by Desperately seeking help!! on November 28, 2010* -
## Organic chemistry

You are at isoelectric point for a solution of Leucine. If the number of negatively charged carboxyl ate groups, -COO-, is 1x10^19, how many positively charged amino groups, NH3+, would there be?

*asked by Becky on October 5, 2011* -
## Ap chem

When 80.4 moles of calcium acetate are dissolved in enough water to make 222.2 milliliters of solution, what is the molarity of acetate ions? Answer in units of M I already tried moles/liter and it was wrong

*asked by Sarah on April 1, 2012* -
## math

3 people each want a set of ....lets say rubber bands($4) also they want the rubber band life prolonging solution($2). Oh snap! How much will it cost each person? How much will it cost altogether? Prove your answer

*asked by Rroyd on September 30, 2010* -
## chemistry

what mass of lead || trioxonitrate(v) would be required to yield 12g of lead || chloride on the addition of excess sodium chloride solution (pb=207,N=1,o=16,Na=23,cl=35.5) pb(No)+2Nacl pbcl+2NaNo

*asked by Daniel on October 18, 2018* -
## chemistry

Copper dissolves in dilute acid ( H2so4) to form a pale blue solution Which of the following equation is correct 1) Cu + H2sO4-----> CuSO4 + h2 2) Cu + 2H2so4--->Cuso4 + 2H20 + 2SO2

*asked by clive on May 5, 2015* -
## CHEMISTRY

Thiosulfate ion S2O32− is oxidized by ioidine according to the following reaction. 2S2O32−(aq) + I2(aq) ¨ S4O62−(aq) + 2I−(aq). If in a certain experiment, 0.0020mole of thiosulfate ion is consumed in 1.0 L of solution in 1 second, what is the

*asked by Juan Pablesteban Gonzalez on April 22, 2014* -
## chem!!

what determines if the heat of solution is endothermic or exothermic for salts? Mostly the competition between the lattice energy (how much energy it takes to break the crystalline strucure) vs the heat of solvation of the ions.

*asked by Anonymous on April 25, 2007* -
## Match, Calculus

help Please... Differential Equations Problems... please give the complete solution, so that i can understand how it is derived... tnx in advance, god Bless... Here are the problems : 1.) y dx + (2x+3y)dy = 0 2.) (2xy + y^(2) ) dx - 2x^(2) dy = 0 ;y = e, x

*asked by Hermione on October 18, 2009* -
## Chemistry

Use activity coefficients to find the concentration of hydrogen ions in a solution of 70.0 mM butanoic acid and 0.1 M NaCl. The ionization constant of butanoic acid is Ka = 1.52 × 10-5. Take the size of C3H7COO– to be 500 pm.

*asked by amanda1012 on September 29, 2012* -
## Chemestry

A sample of crude potassium iodide was analyzed using this reaction (not balanced): I- + SO42- I2 + H2S (acid solution) If a 4.19-g sample of crude KI produced 1.33 g of iodine, what is the percent purity of the KI?

*asked by Santiago on November 23, 2014* -
## algebra

The formula F=95(K−273.15)+32 converts a temperature from kelvin K to degrees Fahrenheit F. a. Solve the formula for K. b. Convert 180ºF to kelvin K. Round your answer to the nearest hundredth. The solution is about K.

*asked by caden on September 25, 2018* -
## Chemistry

I have asked this question before but I was not clear enough. I want to prepare a 37% w/w solution (in water)of sulfuric acid from 96% sulfuric acid. I need around 500ml, I know it won't be exactly that, I want to know how to use the conversion using

*asked by Pam on December 21, 2016* -
## Chemistry

How many moles of solid Mg(OH)2 should you add to 200mL of 0.15M lactic acid solution to produce pH 4.0 buffer? -I don't know how to do this w/0 knowing pKa, but I don't think the point is to look up pKa. Is there some other way to solve this?

*asked by Me on October 14, 2014* -
## Precal

Please help. I'm having a lot of trouble with solving inequalities and graphing them solve the inequality and graph the solution on the real number line x^2+x-6/x I got SS: -infinity to -3 including -3 union -2 to infinity including -2 is that right?

*asked by Abi on June 22, 2013* -
## Chemistry

The following reactions is a first order reaction with respect to nitrite ion and its rate constant is 0.0030/s. In a solution that is 10.0 M NO2-, what is the half-life of the reaction? NH4+ + NO2- -->N2 + 2H2O

*asked by Ceamus Angelina on July 1, 2018* -
## algebra

you are taking a science course in which there will be four tests, each worth 100 points. you have scores of 89, 97, and 95 on the first 3 teests. you must make a total of 360 in order to make an A. what scores on the last test will give you an A? A:

*asked by Carmen on October 4, 2008* -
## Chemistry

How many moles of lithium carbonate are contained in 400 mL of a lithium carbonate solution with a concentration of 0.015 mol L-1? Give your answer as two sig. figures, followed by a space and the units

*asked by Kareena Kapoor on June 13, 2012* -
## chemistry

Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCL concentration by mass and a density of 1.20g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5L of 0.500M HCL

*asked by Monique on November 6, 2011* -
## Chemistry

Chemistry - Sri2734 yesterday at 8:11pm 1) Find the pH of 0.54 M C5H5N(aq) given that its Kb = 1.7×10^-9. The answer I got is 2.75 but I got it wrong. The answer is supposed to be 9.48. Why? 2) Find the pH of a 0.864 M NH4Cl solution given that the Kb of

*asked by Sri2347 on October 28, 2017* -
## Chemistry

What will be the new concentration of PNP, if 30.5 uL of 2.15*10-4M PNP stock solution is mixed with 276.8 uL of water? Report your numeric answer in the units of microMolar (uM) would i divide the molarity by the total concentration

*asked by sean on September 12, 2018* -
## Chemistry

The pH of human blood needs to be between 7.35 and 7.45. You want to prepare a buffer solution that gives a pH of 7.40. You decide to use a sodium phosphate buffer: the acid is H2PO−4 and the conjugate base is HPO2− 4. You want the concentration of the

*asked by Emily on April 19, 2016* -
## Chemistry

A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0867gmL with 140.0 mL of benzene C6H6d=0874gmL. Assuming that the volumes add upon mixing, the molarity (M) and molality (m) of the toluene are?

*asked by Sam on April 5, 2008* -
## chemistry

What is the pH ( 3 significant digits) of a 0.01 M solution of sulfuric acid? Hint is that the first ionization constant is "large", and the second is finite, and the [H+] donated by the second equilibrium depends upon the amount of [H+] already donated by

*asked by lyne on March 25, 2008* -
## Chemistry

The ionization constant of an acid, HX is 1 x 10^-5. When a mixture of 0.100 mol HXand 0.100 mol of NaX is diluted to a volume of one liter by addition of wate, the pH of the resulting solution is very nearly a. 7 b. 6 c. 5 d. 4

*asked by LT on April 15, 2008* -
## Chemistry

Ag2S is an insoluable black solid. Would more solid dissolve, or precipitate once the following are added to the solution. 1. KS-----I know [S] increases, shift to reactants side, precipitate 2. HClO 3. LiOH 4. NH4OH

*asked by Jake on June 20, 2012* -
## Chemistry

4.745 eq. of magnesium will displace how many grams of silver from a silver nitrate solution? I have written the equation as follows: Mg + 2AgNO3 = Mg(NO3)2 + 2Ag I'm not sure how to proceed with converting the 4.745 eq. Any help would be appreciated.

*asked by Jennifer on November 28, 2010* -
## chemistry

A car bumper is plated with chromium using chromium(III) ions in solution. If a current of 54 A flows in the cell for 45 min 30 s, determine the mass of chronium deposited on the bumper.

*asked by Alex on April 20, 2008* -
## gometry

[3.05] In, angle C is (7x - 3) degrees and segment AB = (3x + 12)mm. Part a. What value of x would make equilateral? Part b. What is the perimeter or sum of the lengths of the sides of the equilateral triangle? Be sure to include the unit of measure in

*asked by nina on July 1, 2010* -
## Chemistry

A 0.18 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.13 M) was used to titrate the sample, and 16 mL was required to reach the endpoint. What is the formula weight of the unknown?

*asked by Taylor on April 24, 2016* -
## chemistry

A solution is made by mixing 20.0 mL of toluene C6H5CH3d=0.867gmL with 150.0 mL of benzene C6H6d=0.874gmL. Assuming that the volumes add upon mixing, what are the molarity (M) and molality (m) of the toluene

*asked by Dora on April 3, 2008* -
## Chemistry. please help

A 0.12 g sample of unknown was placed in a flask and dissolved in 125 mL of deionized water. A solution of HCl (0.10 M) was used to titrate the sample, and 18 mL was required to reach the endpoint. What is the formula weight of the unknown?

*asked by Stephanie on December 8, 2010* -
## Mathematics

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.

*asked by SAMARA on July 16, 2012* -
## Chemistry

Determine the number of grams of Potassium Iodate present in 10.0 g of a 0.267 m Potassium Iodate solution.

*asked by Bethany on February 1, 2015* -
## General Chemistry 1412 inorganic

Find the pH of a solution that is 0.30 M benzoic acid (HBz) and 0.25 M sodium benzoate(NaBz). Ka for benzoic acid = 6.5 x 10-5

*asked by generalchem1412 on April 18, 2012* -
## Pre-Algebra [urgent!]

I can't find the solution to this problem; can someone please show me how to solve it step-by-step? Solve the equation for y in terms of x: 1. -8x + 5y = 10 Thanks! -MC

*asked by mysterychicken on May 4, 2009* -
## Mathematics

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.

*asked by INDIANA on July 10, 2012* -
## Algebra

Solve 1.3(7x+4)=1.8(x+5) choose the correct solution set below A){x|x¡Ü84/101} B){x|x¡Ü-84/101} C){x|x¡Ý-84/101} D){x|x¡Ý84/101}

*asked by Patty G on July 18, 2009* -
## Math (Help) thx!

Solve the system using elimination. −7x + 15y = 95 7x − 15y = 115 A. (7,935) B. (935,7) C. (15,1313) D. no solution

*asked by Gopi on January 5, 2016* -
## CHEM

HOW MANY GRAMS OF SALT ARE REQUIRED TO PREPARE 300 G OF 15% SALT SOLUTION? HOW MANY GRAMS OF WATER ARE NEEDED?

*asked by Anonymous on December 4, 2010* -
## math

The equation 6x-7y=5 has a unique solution if x, y are: 1) Real numbers 2) Rational numbers 3) Irrational numbers 4) Natural numbers

*asked by partha on September 20, 2013* -
## Math trigonometry

8sin^2theta+10 sin theta cos theta =3cos^2 theta=0 then general solution for theta is

*asked by Sneha reddy on July 15, 2017*

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