Home
Class 12
CHEMISTRY
One litre of a sample of hard water cont...

One litre of a sample of hard water contains 4.44 mg `CaCl_2 and 1.9 mg` of `MgCl_2`.What is the total hardness in terms of ppm of `CaCO_3` ?

Text Solution

Verified by Experts

The correct Answer is:
6
4.44 mg `CaCl_2` is equivalent to 4 mg `CaCO_3`
1.9 mg `MgCl_2` is equivalent to 2 mg `CaCO_3`
Total wt. of `CaCO_3=6` mg
Hardness in ppm =`(6xx10^(-3))/10^3 xx10^6=6` ppm
Promotional Banner

Topper's Solved these Questions

  • QUALITATIVE ANALYSIS PART 1

    RESONANCE|Exercise A.L.P|39 Videos

  • SOLID STATE

    RESONANCE|Exercise PHYSICAL CHEMITRY (SOLID STATE)|45 Videos

Similar Questions

Explore conceptually related problems

One litre of a sample of hard water contain 4.44mg CaCl_(2) and 1.9mg "of" MgCl_(2) . What is the total hardness in terms of ppm of CaCO_(3)?

One litre of sample of hard water contains 0.8 mg of CaCl_(2) and "0.8 mg of MgCl"_(2) . Find the total hardness in terms of parts of CaCO_(3) , per 10^(6) parts of water by mass.

One litre of a sample of hard water contains 1 mg of CaCl_(2) and 1 mg of MgCl_(2) . Find the total hardness of water in terms of parts of CaCO_(3) per 10^(6) parts of water by mass.

One litre sample of water contains 0.9 mg CaCl_(2) and 0.9 mg of MgCl_(2) . Find the total hardness in terms of parts permillion of CaCO_(3) .

One litre of a sample of hard water contains 5.55 mg of CaCl_(1) and 4.75 mg of MgCl_(2) . The total harness of ppm of CaCO_(3) is

A water is said to be soft water if it produces sufficient foam with the soap and water that does not produce foam with soap is known as hard water. Hardness has been classified into two types (i)Temporary hardness (ii) Permanent hardness. Temporary hardness is due to presence of calcium and magnesium bicarbonate. It is simply removed by boiling as Ca(HCO_(3))_(2)overset(Delta)rarr CaCO_(3)darr+CO_(2)uarr+H_(2)O Mg(HCO_(3))_(2)overset(Delta)rarr MgCO_(3)darr+CO_(2)uarr+H_(2)O temporary hardness can also be removed by addition of slaked lime, Ca(OH)_(2) Ca(HCO_(3))_(2)+Ca(OH)_(2) to 2CaCO_(3)darr+2H_(2)O permanent hardsness is due to presencce of sulphates and chlorides of Ca,Mg,etc. It is removed by washing soda as CaCl_(2)+Na_(2)CO_(3) to CaCO_(3)darr+2NaCl CaSO(4)+Na_(2)CO_(3)to CaCO_(3)darr+Na_(2)SO_(4) Permanent hardness also removed by ion exchange resin process as 2RH+Ca^(2+)toR_(2)Ca+2H^(+) 2ROH+SO_(4)^(2-) to R_(2)SO_(4)+2OH^(-) The degree of hardness of water is measured in terms of PPm of CaCO_(3) 100 PPm means 100 g of CaCO_(3) is present in 10^(6) g of H_(2)O . If any other water sample which contain 120 PPm of MgSO_(4) , hardness in terms of CaCO_(3) is equal to =100 PPm. One litre of a sample of hard water (d=1 g/mL) cotains 136 mg of CaSO_(4) and 190 mg of MgCl_(2) . What is the total hardness of water in terms of CaCO_(3) ?

A sample of hard water contains 1 mg CaCl_2 and 1 mg MgCl_2 per litre. Calculate the hardness of water in terms of CaCO_3 present in per 10^(6) parts of water. (a). 2.5 ppm (b). 1.95 ppm (c). 2.15 ppm (d). 195 ppm

Solution of 100 ml water contains 0.73 g of Mg(HCO_(3))_(2) and 0.81g of Ca(HCO_(3))_(2) calculate the hardness ini terms of ppm of CaCO_(3)

Washing soda ( Na_2CO_3.10H_2O ) is widely used in softening of hard water. If 1L of hard water requires 0.0143g of washing soda, what is hardness of water in terms of p p m of CaCO_3 ?

RESONANCE-RANK BOOSTER-All Questions
  1. One litre of a sample of hard water contains 4.44 mg CaCl2 and 1.9 mg ...

    Text Solution

    |

  2. The reduction potential of hydrogen half cell will be negative if :

    Text Solution

    |

  3. A very thin copper plate is electro- plated with gold using gold chlor...

    Text Solution

    |

  4. We have taken a saturated solution of AgBr,K(sp) of AgBr is 12xx10^(-1...

    Text Solution

    |

  5. At what [Br^(-)]/sqrt(CO(3)^(2-)] does the following cell have its rea...

    Text Solution

    |

  6. Consider the cell Ag(s)|AgBr(s)Br^(c-)(aq)||AgCl(s),Cl^(c-)(aq)|Ag(s) ...

    Text Solution

    |

  7. For a saturated solution of AgCl at 25^(@)C,k=3.4xx10^(-6) ohm^(-1)cm^...

    Text Solution

    |

  8. With t taken in seconds and I taken in amp, the variation of I follows...

    Text Solution

    |

  9. You are given the followin cell at 298 K, Zn|(Zn^(+ +) .((aq.))),(0.01...

    Text Solution

    |

  10. A resistance of 50Omega is registered when two electrodes are suspende...

    Text Solution

    |

  11. the standard reduction potenital of a silver chloride electrode is 0.2...

    Text Solution

    |

  12. Calcualte the cell EMP in mV for Pt|H(2)(1 atm) | HCl(0.01 M)|| AgCl...

    Text Solution

    |

  13. Calculate the value of Lambda(m) ^prop for SrCl(2) in water at 25^(@)...

    Text Solution

    |

  14. Select the correct statement if- E(Mg^(2+)//Mg)^(@)=-2.4V, E(Sn^(4+)...

    Text Solution

    |

  15. For the cell (at 298K) Ag(s) | AgCl(s) | Cl^(-)(aq)|| AgNO(3)(aq) | ...

    Text Solution

    |

  16. Peroxodisulphate salts, (e.g., Na(2)S(2)O(8)) are strong oxidizing age...

    Text Solution

    |

  17. In which of the following cell(s): E("cell")=E("cell")^(@)?

    Text Solution

    |

  18. A current of 2.68A is passed for one hour through an aqeous solution o...

    Text Solution

    |

  19. Which is/are correct among the following? Given the half cell EMFs E...

    Text Solution

    |

  20. Mark out the correct statement(s) regarding electrolytic molar conduct...

    Text Solution

    |

  21. Statement-1:Zinc protect the iron better than tin even after it cracks...

    Text Solution

    |