# Please observe the solution for the following two problems : (a) 2x + 18 = x + 25 (b) 3x + 5 = 7x - 15 (a) 2x + 18 = x + 25 2x - x = 25 -

30,299 questions, page 160
1. ## chemistry

Calculate the ionization constant, Ka, of phenol (HC6H5O), a weak acid, if a 0.25 M solution of it has a pH of 5.24.

asked by Audrey on November 15, 2010
2. ## Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

asked by Bobbi on March 3, 2011
3. ## chemistry

the solution contain 6 grams of caustic soda dissolved per dm.find the percentage impurity

asked by ahmed on November 15, 2010
4. ## chemistry

how many grams of NaOH must be added to 0.250 litres of water to form a solution of PH=10.0?

asked by joey on September 7, 2010
5. ## value

what happens when a solution of iron 2 sulphate in a test tube was bubbled through chlorine gas

asked by value on September 24, 2016
6. ## Chemistry

need help balancing the following. redox reaction in acidic solution. Clo3-+Cl->>Cl2+ClO2

asked by chuckles on December 2, 2012
7. ## gpc

Calculate the molarity of a bleach solution that is 8% by mass (m/v) or 8g/100mL sodium hypochlorite.

asked by samry on March 3, 2014
8. ## pre-calculus

please help me with thisone thanks solve the inequality algebraically. Express the solution in interval notation. (x-8)^2/x^2-36 > 0

asked by dave on March 1, 2011
9. ## Chemistry

if 25.0 mL of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution? i got 3M but i don't think its right

asked by Anonymous on March 4, 2014
10. ## math

the function has a real zero in the given interval. approximate this solution correct to two decimal places. f(x)=x^4-x^3-7x^2+5x+10; (2,3)

asked by fast80us on March 1, 2011
11. ## Chemistry

if 25.0 mL of 15M nitric acid is diluted to 125 mL, what is the concentration of the new solution? i got 3M but i don't think its right

asked by Anonymous on March 4, 2014
12. ## chemistry

Battery acid is 4.27MH2SO4(AQ.) And density of 1.25g/ml . What is the molality of H2SO4 in the solution

asked by anjali on May 3, 2015
13. ## Chemistry

What is the molarity of a solution that results when 3.64 g KCl is dissolved in water and diluted to exactly 200.0 mL?

asked by Van on February 27, 2016
14. ## chemistry

If you begin with 0.030 L of a 2.5M NaOH solution, what concentration will you end up with if you dilute it to 0.050?

asked by Anonymous on February 22, 2016
15. ## science

If 2.7 moles of copper metal was deposited from a solution of Cu(NO3)2, how many electrons were involved?

asked by Andrea on April 18, 2013
16. ## Algebra

Solve by substitution method. 6x+9y=-12 -5x+y=27 What is the solution of the system? Type an ordered pair... Please help Thanks!

17. ## chemistry

What is the concentraton of a solution made by dissolving 0.5 moles of solute in 9.0 liters of water?

asked by Juliettte on March 5, 2011
18. ## math

What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

asked by Julie Anne on September 7, 2010
19. ## Math

Help-I just started Algebra II and I'm lost. What is the solution of 10 = absolute value of 7-3x. Please show steps so I can understand

asked by Joel on September 7, 2010
20. ## Chemistry

if 20.00 grams of NaOH are diluted in enough water to make 1.00 liter, what is the molarity of the solution?

asked by Anonymous on December 5, 2012
21. ## Math

What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

asked by Julie Anne on September 7, 2010
22. ## Chemistry

Determine how much of a 0.780M K2Cr2O7 solution is required to completely dissolve 4.70g of Cu

asked by Maegan on December 5, 2012
23. ## Chemistry

What mass of sucrose, C12H22O11, is needed to make 500mL of a 0.20M solution? Help please... Thanks.

asked by Lucy on November 18, 2007
24. ## chemistry

What is the molality of a solution which contains 20.0 g of cane sugar, C12H22O11 dissolved in125g of water?

asked by george on April 15, 2013
25. ## Density of a CUSO4 solution

I need to determine the density of a CUSO4 solution of 1% concentration from a 10cc pipette volume.

asked by Lorraine on March 6, 2011
26. ## Algebra

What is the solution of 7 + m is greater than or equal to 2 and m + 1 is less than 2? Please explain or show how you got the answer-I'm having a really hard time

asked by JulieAnne on September 7, 2010
27. ## Math

2 liters of cleaning solution is 65% ammonia. How much water must be added to dilute it to a 40% soulition?

asked by Ashley on September 29, 2016
28. ## chemistry

Determine the pH of a 0.045mol dm–3 solution of sodium ethanoate (ethanoic acid: pKa=4.75).

asked by Kay-Anna on September 30, 2015
29. ## chemistry

what is the total molarity of all the ions present in 0.1M cuso4 and 0.1M al2(so4)3 solution?

asked by banda on September 30, 2015
30. ## Chemistry

how many grams of potassium dichromate are needed to make 250 mL of a 0.75 molar solution?

asked by Bobbi on March 3, 2011
31. ## Chemistry

What is the molarity of a solution prepared by diluting 25.0 mL of 0.412 M magnesium nitrate to a volume of 1.50 L please help!

asked by Ashley on November 30, 2012
32. ## Calculus

Find the particular solution of the differential equation y'=(5x+21y)/7x satisfying the initial condition y(1)=5.

asked by Hannah on November 18, 2010
33. ## science

how many milliliters of 5.5M H2so4 must you use to prepare 500ml of 0.2M sulfuric acid solution? Please hurry!!!!!!

asked by grant on December 14, 2012
34. ## CHEM

WHAT IS THE pH of 1.00 molar solution of NaNO3(aq)? The Ka for nitric acid is 0.0007.show all calculations

asked by Zitha on March 12, 2011
35. ## chemistry

What is the molar concentration of calcium hydroxide that has 0.185g solute in 100ml solution?

asked by n/a on March 12, 2011
36. ## science: chemistry

How many moles of NaOH must be added to 1.0 L of 2.6 M HC3H5O3 to produce a solution buffered at each pH? 1)pH= 4.28 2)pH=pKa

asked by Julie on July 23, 2015
37. ## Chemistry

What volume of 0.200 N H2SO4 is required to neutralize a solution containing 8.00 equivalents of NaOH?

asked by Joe on November 10, 2010
38. ## Chemistry

What volume of 0.25 mol L-1 sodium nitrate solution could be prepared using 6.00 moles of compond?

asked by Jacob Paul on November 27, 2012
39. ## Chemistry

Balance the following redox reaction in basic solution. H2(g)+Fe3+(aq) ---> H2O(l)+Fe2+(aq)

asked by Anonymous on October 23, 2016
40. ## Chem 2

what mass of Iodine(I2) must be used to prepare a .960m solution if 1000g of ethanol (C2H5OH0 is used?

asked by Cassidy on December 17, 2012
41. ## College Chemistry Help Please!

what is the pH of a solution that is 0.200 M in methylamine, CH3 NH2 CH3NH2+ H20 CH3NH3+ + OH- Kb= 4.2 x 10 ^-4

asked by shanice on November 9, 2010
42. ## chemistry

In an electrolytic solution the density of CuSO4 decreases or increases or remains constant?

asked by prashant on September 12, 2016
43. ## Science

Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

asked by Kamal on April 29, 2013
44. ## Science

Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

asked by Kamal on April 29, 2013
45. ## Science

Find out the molality of acetic acid ch3cooh whose molarity is 2 and density of solution is 1.20 g/ ml ?

asked by Kamal on April 29, 2013
46. ## Chemistry

How would the freezing point of a solution change if the unknown had ionized or dissociated? Explain.

asked by G on March 14, 2011
47. ## chemistry

how do i find the grams of potassium chloride per 100g of water in the saturated solution

asked by sam on November 27, 2012
48. ## Chemistry

what is the mass percent of a solution made by dissolving 35.5 g. of NaCl in 500 g. of water?

asked by Dillan on September 27, 2015
49. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution.

asked by Rebecca on October 14, 2007
50. ## science

23g of salt is dissolved in 100g of water at 23 k. what is the concentrarion of solution at this temperarure.

51. ## chemistry

how many grams of NaCl (molecular weight 58.5) should be used to prepare 20 liters of a solution containing 154mEq/L?

asked by mary on February 27, 2011
52. ## Chemistry

Balance the following equation for a basic solution. MnO4-+C2O4-2= Mno2 + CO3-2

asked by Brittney on October 27, 2013
53. ## College Chem

How many mL of concentrated ammonia (14M) should be diluted to 250 mL to make a 0.75 M NH3 solution?

asked by Lisa on November 19, 2010
54. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

asked by AREEJ on November 30, 2012
55. ## Analytical Chemistry

How many mg of X is contained in 25 ml of a solution giving an absorbance of 0.250 at 400 nm when measured with a 1 cm cell ?

asked by AREEJ on November 30, 2012
56. ## CHEMISTRY

What mass of NaCl is required to precipitate all the Ag ions from 20 mL of .100 M AgNO3 solution

asked by CIndy on April 22, 2013
57. ## algebra ll

Show the work to solve |2x+5| -1 < 6 and describe the graph of the solution in a complete sentence.

asked by justina on August 30, 2011
58. ## Inorganic Chemistry

What is the mole fraction of solute in a 1.00 molal solution in which toluene (C7C8) is the solvent.

asked by Cris on October 16, 2016
59. ## economics

Why would assigning property rights be a solution to pollution caused by burning coal?

asked by autumn on December 6, 2007
60. ## science

How much sugar must be added to 50g of water to make a saturated solution at 0 degrees?!

asked by Danielle on November 29, 2012
61. ## math

If 6 is added to the numerator and denominator of the fraction 7/9,what will be the value increase or decrease ?by how much ?i need solution answer

asked by sheirra on September 17, 2016
62. ## science

Calculate the amount of h2so4 required for preparing 500ml of 2MH2so4 solution.

asked by v¨ªşhął on February 29, 2016
63. ## chemistry

How many grams of na3po4 will be needed to produce 425ml of a solution that has a concentration of na+ ions of 1.30 M?

asked by James on September 11, 2010
64. ## Chemistry

Calculate volume of 6MHCL required to prepare a 250 ml of a 0.15MHCL solution??

asked by Karen on April 9, 2013
65. ## chemistry

What is the concentration when 60.0 mL of a 9.00 M HCl solution is diluted to 1.170 liters? and how do you solve this problem?

asked by katie on April 4, 2013
66. ## Science

Determine the pH of a 0.62M NH4NO3 solution at 25oC. The Kb for NH3 is 1.76x10-5. Calculate Ka

asked by Manushi on December 28, 2016
67. ## Chemistry

What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?

asked by Erin on October 9, 2012
68. ## Chemistry

what is the percent by mass of a solution by dissolving 200 g of NaCI in 500 mL of water?

asked by Annyssa on June 15, 2016
69. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

asked by mike on October 7, 2012
70. ## chemistry

calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution

asked by mike on October 7, 2012
71. ## Chemistry

What is the pH of a solution obtained by adding 15 g deK2SO4em 150 ml NaHSO4 with Molarity of 0, 2 m. HSO4 Ka = 1, 3.10^-2

asked by Arya on March 26, 2016
72. ## chemistry

The bottle of hydrogen peroxide from the store says it is a 3% solution by mass. What is its molal concentration?

asked by billy bob j on April 17, 2008
73. ## chem 2

What concentration of NaF is required in order to convert a 0.15M HF solution to a buffer with a pH of 5.50?

asked by emily on December 5, 2010
74. ## Chemistry

The solution "head" dissolves in the water and the mixing "tail" dissolves in the oil. or The mixing "head" dissolves in the water and the solution "tail" dissolves in the oil. which one is right? thank you for your time!

asked by Baby on April 17, 2008
75. ## chemistry

what is the balanced equation for potassium iodide and solid zinc in an acidic solution

asked by Anonymous on June 21, 2010
76. ## Chemistry

Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl(aq) and 0.075 M in HBr(aq) at 25°C.

asked by Alex on October 6, 2012
77. ## molarity

what mass of sodium hydroxide, NaOH, must be dissolved to make 460 ml of a 1.10 M solution

asked by erica on February 27, 2008
78. ## chemistry

What is the volume in liters of a 0.760M K3PO4 solution containing 220.9g of potassium phosphate?

asked by Chris on February 7, 2013
79. ## Pre-Calculus

Find the unknown in the following equation. If there are more than one solution, then separate the solutions with a comma. (−8y−4)^2+10=14 y=? I keep on getting y=-0.5, is that correct?

asked by Ann on October 6, 2013
80. ## algibra

In two or more complete sentences, describe how you would draw the graph of the solution set for the following inequality. -3m+18 < 30

asked by myndie on January 23, 2017
81. ## Chemistry

What is the osmotic pressure in atmospheres of 40.00% ( m/v) NaCl solution at a temperature of 0.0 degrees celcius

asked by Ruffles on December 4, 2013
82. ## Chemistry lab

What mass of NaOH is required to prepare 500.0 mL of 0.1029 M stock solution?

asked by Donnie on October 9, 2012
83. ## chemistry

Consider two beakers, one with water and other one with sodium chloride solution. Which of these will have higher vapor pressure

asked by Angel on June 20, 2010
84. ## chemistry

How many grams of calcium nitrate, Ca(NO3)2, are needed to make 100 mL of a .5 M solution?

asked by Anonymous on October 24, 2010
85. ## chemistry

how many mL of the above 5.00% solution are needed to make 100 mL of physiologic saline (.90 sodium chloride)?

asked by Anonymous on October 24, 2010
86. ## General Chemistry

How many milliliters of 0.5M NaOH must be added to 200 mL of 0.1M NaH2PO4 to make a buffer solution with a pH of 6.9?

asked by Joanna on January 31, 2013
87. ## chemistry

What would be made if hydrogen sulphide gas was bubbled through a solution of zinc nitrate

asked by kennedy on January 4, 2017
88. ## chem

A solution that is formed by combining 600. mL of 0.20 M NaOH with 400. mL of 0.40 M HNO3 has an H+ concentration of

asked by leona on June 19, 2010
89. ## Chemistry

Calculate the mass of HF required to prepare 200 mL of 0.25 mol/L solution. P = 40%; d = 1.14 g/cm3

asked by Jacke on June 21, 2016
90. ## Chemistry

Suppose you are given a sample of a homogeneous liquid. What would you do to determine whether it is a solution or a pure substance?

asked by Shannon on August 15, 2010
91. ## Chemistry

The pH of a 0.0050 M aqueous solution of calcium hydroxide is? Make sure to include all equations.

asked by Student on December 3, 2010
92. ## Chemistry

What is the osmotic pressure in atmospheres of a 15% sucrose solution at a temperature of 25 degrees celcius

asked by Ruffles on December 4, 2013
93. ## Chemistry

What volume of 0.159 M Na3PO4 solution is necessary to completely react with 92.6 mL of 0.119 M CuCl2?

asked by Anonymous on October 21, 2015
94. ## chem

What mass of KCl (MM = 74.55 g/mol) is required to make 600 mL of a 0.175 M solution

asked by whitney on April 12, 2011
95. ## biology 110

using a spectrophotometer what is the relationship between absorbance and the concentration of light absoring substance in a solution.

asked by kim on February 23, 2008
96. ## math

What are the steps to the solution for this problem? What is the difference between 330 and half n equals 114?

asked by Sandra on April 13, 2011
97. ## Chemistry

What is the osmotic pressure in atmospheres of a 15%(m/v) sucrose solution at a temperature of 25 degrees celcius

asked by Ruffles on December 4, 2013
98. ## chemistry

How many grams of rubidium chloride are present in 125.0 mL of a 1.75M RbCl solution?

asked by Chris on February 7, 2013
99. ## Chemistry

In a titration of 35.00 mL of 0.737 M S, __________ mL of a 0.827 M KOH solution is required for neutralization.

asked by Charlie on October 5, 2012
100. ## pre-calculus

solve for the follow inequality. write your solution in interval notation. x^3-49x¡Ü0