Titration of an Antacid (Lab Report Sample)
The lab report involves determining the concentration calcium carbonate in an antacid tablet using back titration.
source..Student’s Name
Professor’s Name
Course
Date
CH 111 – Introduction to Inorganic and Organic ChemistryLab 7 – Exp. 478 – Titration of an Antacid
In this lab we are going to determine the amount of HCl one antacid tablet can neutralize. We are going to utilize a titration to perform this analysis, however we cannot do the standard titrations we have done the previous 2 labs. Instead we will be performing something called a back titration.
A back titration involves adding an excess of one of the reactants in the neutralization reaction, and then titrating back the excess amount added. This is necessary because the antacid tablet is insoluble in water, so in order to get the ions in solution we must first react the antacid (Calcium Carbonate (CaCO3)) with excess HCl, according to reaction 1 below. Some of the HCl will be neutralized by the CaCO3, but the excess will remain in the flask. The excess HCl will then be titrated with NaOH, just as we did in Exp. 5 according to reaction 2 below. Since we will know the exact amount of HCl added, we can determine the amount of HCl that that was not neutralized by the antacid. We can then determine the amount of HCl that was neutralized by the antacid.
1 2049145119136002 HCl (aq) + CaCO3 (s) CaCl2 (aq) + H2O (aq) + CO2 (g)
Antacid
2 20540781204060HCl (aq) + NaOH (aq) NaCl (aq) + H2O (aq)
Excess HCl
Supplementary Questions
1 What was the mass of the tablet in the video?
0.338g
2 What was the concentration of the NaOH in the video? (Normal is the same as Molar in this example.)
0.1117M
3 How many mL of distilled water did he add?
No amount of water was added to the samples.
4 How many drops of phenolphthalein were added?
6 drops
5 Why does HCl need to be added to the tablet in the beginning of the experiment?
The HCl is added to neutralize the CaCO3
Data Sheet
Trial 1
Trial 2
Mass of Antacid Tablet (g)
0.6274
0.6111
Molarity HCl (M)
0.600
Volume HCl Added to Tablet (mL)
25.0
Molarity NaOH (M)
1.00
Volume NaOH initial (mL)
1.2
0.4
Vol
Other Topics:
- Ray Optics Analysis EssayDescription: Converging lenses are designed in such a way that parallel light incident on either side of the lens penetrates through one point on the opposite side. This point of convergence is referred to as the focal point and it is denoted by letter f. The convergence of the light at the focal point is caused by refraction at both surfaces of the lens ...3 pages/≈825 words| 3 Sources | MLA | Life Sciences | Lab Report |
- Gay-Lussac's Law: Combining Volumes of Gases Lab ReportDescription: Gay-Lussac's Law: Combining Volumes of Gases Lab Report According to Avogadro's gas law, the volume of a gas is directly proportional to the number of constituent moles at constant temperature and pressure. One of the ways of mathematically expressing the law is shown below in equation (1)....3 pages/≈825 words| No Sources | MLA | Life Sciences | Lab Report |
- Density, Definition, How We Calculate It, Examples, What Affects It And HowDescription: Density is calculated by dividing the mass of a specific object with its volume. It is a property which characterizes each substance. The mass of atoms, their size, and how they are positioned are related to the density of a substance....4 pages/≈1100 words| 3 Sources | MLA | Life Sciences | Lab Report |
