How Does the Amount of Dissolved Nacl in Water Effect the Volume of One Drop? Essay Sample
How does the sum of dissolved NaCl in H2O consequence the volume of one bead? Purpose: This experiment plans to mensurate the volume of one bead of H2O and compare it the volume of one bead of Na chloride solution. What will be attempted by this experiment is to mensurate the volume of one bead of distilled H2O by mensurating a control and comparing it the volume of one bead of distilled H2O with dissolved NaCl. This will be done by utilizing a burette for dropping the distilled H2O and a electrolyte solution. Hypothesis: I hypothesise that the volume of one bead of H2O will diminish as the concentration of NaCl additions.
I believe this is due to the type of intermolecular bonding nowadays and the different densenesss of salty and pure H2O. Water is held together by the strongest intermolecular force called H bonding.
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This bonding is so replaced by ion-dipole when salt is dissolved in the H2O which is a weaker intermolecular force compared to hydrogen bonding. “Generally talking. Hydrogen bonding is stronger ( 20-40 KJ/mol ) than ion-dipole ( 10-20 KJ/mol ) ” ( “Chemicalforums” ) . The H2O is so non held together as tightly and less force is needed to divide one bead from the chief organic structure of H2O. It would hence be expected that the volume of the bead would be less as the gravitative force on a substance is straight relative to its mass. shown by the equation below. F= ( G?m_1 m?_ ( 2 ) ) /r^2
m_1=mass of object 1. Which in this instance is changeless as it refers to the mass of the Earth. m_2=mass of object 2. Which is the mass of the bead r^2= the distance between the objects.
F= gravitative force
Therefore if the force to divide the H2O is less the gravitative force needed for a bead of H2O to fall would be less. this so means the mass of the bead would so be less as all other variables are kept changeless. Besides due to the fact that salty H2O is more heavy than pure H2O it would intend that the volume of one bead of salty needed to get the better of intermolecular forces would be less as salty H2O has a higher mass per volume ratio. Apparatus used
Apparatus Range Accuracy
Burette 1-50 milliliter ± 0. 01cm?
Electronic Scale 0. 01-600 g± 0. 01 g
Measuring cylinder 5-50 ml± 0. 25 cm?
Funnels with funnel paper
Independent VariableDependent Variable
Concentration of NaCl will be altered by altering the sum of NaCl ( g ) added to 50 cm? of distilled H2O. The volume of one bead of H2O measured in cm? . Control Variables
How will it be controlled? Why will it be controlled? Same equipment usedBy utilizing the same burette To guarantee that the equipment does non alter or consequence the volume of the beads of H2O. Different burettes can hold somewhat different bead sizes and to minimise that change the same burette should be used for all trials. Temperature By utilizing H2O baths to command the temperature of the H2O added to the burette. Temperature may hold its ain consequence on the bead sizes of H2O and so it should be kept changeless to guarantee that all alterations in volume of bead sizes is due to the independent variable. Type of Salt Use the same type of salt in all tests. To guarantee that different drosss in the salt that may fade out in to the H2O do non impact the volume of one bead the same type of salt should be used. Refined iodinated tabular array salt is preferred as it is 99. 5 % pure and the sum of drosss is minimal. However any type of salt can be used every bit long as it is unbroken changeless. Type of H2O Always usage distilled H2O. Water from different beginnings may hold drosss which could impact the entire mass of the H2O and could impact the volume of one bead of H2O. Using distilled H2O would do certain no drosss would impact the volume of one bead.
Measure out 30 milliliter of distilled H2O utilizing a calibrated cylinder into a 100ml beaker
Add 5 gms of salt to the beaker in measure 1 and stir
Prepare 30ml solutions following measure 1 and 2 with 0. 10. 15. and 20 gms of salt
Add the salt solution to a burette and record initial reading
Topographic point a beaker on top of an electronic graduated table and tare
Open the burette to a point where H2O drops at a slow rate into the beaker
Count the sum of beads until the mass of the H2O in the beaker reaches 5 gms and take the concluding reading from the burette
Repeat with the different salt solution prepared in measure 3
Repeat from measure 1. two more clip so an norm can be calculated. Calculations
( Concluding Reading-Initial Reading ) / ( The sum of beads ) =The volume of one bead ( cm? )
( ?-x ) /N=Mean
Albert. “Ion Dipole Dipole vs. Hydrogen Bonding. ” Chemicalforums. com. Mitch Andre Garcia. 23 Sept. 2011. Web. 27 Jan. 2013. . Chang. Muncel. “Salt Water vs. Fresh Water. ” About. com. N. p. . 19 Sept. 2000. Web. 27 Jan. 2013.