## open_study1 3 years ago 50 ML of 0.001 M phosphoric acid are exactly neutralized by the addition of 0.005 N Naoh the molarity of resulting salt is?

1. open_study1

@Callisto help

2. Callisto

Sorry.. I haven't learnt it :|

3. open_study1

ok

4. .Sam.

$\begin{array}{c} \text{H}_3\text{P}\text{O}_4 \\\end{array}\text{ + }\begin{array}{cc} 3 & \text{Na}\text{O}\text{H} \\\end{array}\text{ \longrightarrow  }\begin{array}{cc} 3 & \text{H}_2\text{O} \\\end{array}\text{ + }\begin{array}{c} \text{Na}_3\text{P}\text{O}_4 \\\end{array}$ ------------------------------------ $M_AV_A=M_BV_B$ $\text{Molarity of base is}~~ M_B$ $\text{Molarity of acid is}~~ M_A$ ------------------------------------ $M_B=\frac{M_AV_A}{V_B}$ Sub in the values

5. Preetha

Don forget the stoichiometric ratios. for every mole of phosphoric acid, you need 3 moles of NaOH to neutralize it. So you have to include that factor of 3 in the above calculation. It is a 1: 3 not 1:1 relationship. Try it and see.

6. open_study1

@Kryten help!

7. Kryten

as i see it you got all you need you just need to put numbers in.... only way to learn how to solve this kind of things is to do it yourself...

8. open_study1

i solve it but not getting lol @Kryten thats why i called u

9. open_study1

if u get after solving that then inform me

10. open_study1

The answer should be 6.25 * 10^-4 moles

11. open_study1

but i am not getting that @Kryten

12. Kryten

this is really basic chemistry, begin with writing equation, then write down what you have and what you need and do the magic... put the relationships of reactants and products in equations and just crunch the numbers...

13. open_study1

@.Sam. not getting the answer by ur way

14. open_study1

@Kryten not getting!!!

15. open_study1

i wrote the equation

16. .Sam.

6.25 * 10^-4 moles This is in moles, I thought you want molarity?

17. open_study1

@Kryten do u have any idea

18. open_study1

i am confused in question it is asked to find molarity but the answer is given in 6.25*10^-4

19. Kryten

yea i have some idea but i gotta run students arent waiting i need to keep them safe... see you later

20. open_study1

@Vincent-Lyon.Fr do u have any idea....

21. Vincent-Lyon.Fr

I won't answer any of your questions as you are pestering this study site without ever doing any effort on your own.

22. open_study1

@Vincent-Lyon.Fr i did but not getting!

23. shivam_bhalla

@open_study1 , my answer is same as @Vincent-Lyon.Fr 's

24. open_study1

@shivam_bhalla i tried ny level best but i am unable,

25. shivam_bhalla

@.Sam. and @Preetha have given you the valuable hints and tips . Just go ahead and solve it. you have to find the number of moles of H3PO4 initially reacting from given info

26. HairtUB

What's M and N?

27. open_study1

M=molarity N=normality

28. open_study1

moles = 5*10^-5 moles

29. shivam_bhalla

Yes. Now continue and do the rest of the problem.

30. open_study1

now wat to do

I'm sorry i don't know this :).

32. open_study1

@shivam_bhalla r u there....

33. open_study1

Plzzz help anyone plzz!

34. open_study1

@Kryten HELP

35. open_study1

I FOUNDED THE MOLE THEN WAT TO DO???

36. open_study1

@Kryten PLZZ GUIDE ME PLZZ

37. open_study1

OH........OH..........PLZZZZ SOME ONE HELP! I AM WAITING FOR 1 DAY PLZZZZ

38. open_study1

5*10^-5 moles

39. Kryten

in your place i would give up on pleading and solve it myself... you have been give instructions by multiple people and you just need to follow them, point is that you want it to be solved so you god forgive wouldnt have to hitch your little grey cells...

40. open_study1

I DID IN THE WAY THEY GUIDED BUT NOT GETTING I FOUNDED THE MOLES THEN WAT TO DO PLZZ TELL ME THE STEPS I WILL SOLVE MY OWN @Kryten

41. Kryten

first send some proof that you did anything (picture of paper of your tries) and then ill help. this is i think your third time you post this question and you just need to read what people have written... look up and read all carefully

42. open_study1

0.15=0.005*V V=30ML

43. open_study1

0.05 MILLI MOLES OF H3PO4 ON REACTING GIVES 0.05 MILLI MOLES OF NA3PO4 IE 5*10^-5 MOLES OF NA3PO4 ARE FORMED

44. open_study1

@Kryten

45. open_study1

46. Kryten

now lets start from the begining write first what data you have, chemical reaction equation and then write what you need from data to be calculated

47. open_study1

H3PO4 + 3NaOH ⟶ 3H2O + Na3PO4

48. open_study1

WE HAVE TO FIND THE MOLARITY OF NA3PO4

49. Kryten

write your data properly ex. c(X)= ... V(X)=... c(Y)=.... and then what you need to calculate ex. c(z)=?

50. open_study1

WAT IS C(X)

51. Kryten

that are examples how to write your data properly now lets see you do it

52. open_study1

V(PHOSPHORIC ACID)=50ML M(PHOSPHORIC ACID)=0.001M N(NAOH)=0.005N M(NA3PO4)=?

53. open_study1

IS THAT CORRECT.........

54. Kryten

ok now lets see you have written N(NaOH)=0,005N --> that doesnt exist cause N(NaOH) is marking of number of NaOH atoms and it has no units, and furthermore write it one under another not one next to other cause that is vast. now lets see corection...

55. open_study1

NORMALITY OF NAOH=0.005N

56. Kryten

now please explain to me what is normality and then write all data again properly

57. open_study1

NO OF EQUIVALENT OF SOLUTE IN ONE LITRE OF SOLUTION

58. Kryten

ok now explain me the unit N what is its derivative

59. open_study1

N= WG OF SOLUTE /(EQUIVALENT WG OF SOLUTE * VOLUME(L))

60. Kryten

ok now when you explained it all carry on and write all data properly one item under other and under it all chemical equation

61. open_study1

@Kryten ANYHOW THANZZZ I HAVE TO GO NOW PLZZ GIVE ALL THE HINTS I WILL LOOK IT AFTER WARDS............

62. Kryten

no way, you will write all here so i see what you are doing...

63. open_study1

hello

64. open_study1

@Kryten

65. Kryten

continue where you stoped, write all on one place...

66. open_study1

thats all wat i knw

67. Kryten

but you still havent written all in one place properly

68. open_study1

oh....no wat else u want

69. Kryten

i would like a cold bear and a steak but what you want is the question

70. open_study1

this website was made to help!!!! so plzz

71. Kryten

i am helping you but you are resisting to it... take a look how i solved your past questions where i photographed my work, it was all in sequence like it should be and that is the only way i will help you if you do it properly and as it should be solved and when you get that routine all this will be easy for you so your choice...

72. open_study1

yes u helped me a lot earlier by risiking a lot but i want the reson now why u r not helping that way did any one force u???

73. open_study1

such as @vincent fr @aravind etc......

74. Kryten

no, but i realised that you are taking a path of least resistance which is not good... this site is for learning and not getting all solved with no effort...

75. Kryten

now lets skip all the debate and tell me if you want to do it with my help properly or with no help at all

76. open_study1

i want help

77. Kryten

so whats the problem then... take a look how i solved your past questions and write it all like that here step by step and with understanding and reason why is it like it is for each step so that you LEARN how to solve problems like this...

78. open_study1

ok let me try

79. ujjwal

Its been two days.. LMAO..

80. open_study1

yes no one seems to help me........

81. siddhantsharan

Is the Answer 3.33 x 10^-4 ?