top-rated free essay

Reacting Acids and Bases Lab Report

By krpm21 Jan 09, 2013 716 Words
Reacting Acids and Bases Lab Report
Every liquid, except for distilled water, has either acidic or basic traits. An acid is sour tasting, and gives a sharp stinging pain in a cut or wound, and bases taste bitter, and feel slippery. A pH scale is used to determine what traits a liquid has; acidic or basic. The scale focuses on OH- (hydroxide ions) and H+ (hydrogen ions). The scale goes from 0 to 14. 7 is distilled water, as it is directly in the middle; neither acidic or basic. Acids are between 0 and 7 and have a high H+ concentration, and bases from 7 to 14 with a low H+ concentration. Neutralization happens when an acid and base react together and the base is consumed. The product is a neutral solution of water and a salt. HCl (acid) + NaOH (base) changes to H2O and NaCl (water and salt). The purpose of this lab was to determine what happens when and acid reacts with a base, and how to detect a neutralization.

Table: Acids and Bases Lab 2
Compound |Observations |Type of Compound (Acid/base? Ionic/Covalent?) |Amount (Drops) |Conductor of Electricity? Yes/ No | |NaOH (0.5 mol/L)
Reactant |Clear, odourless, liquid |Base

Ionic |20 |Not tested | |Phenolphthalein Indicator
|Clear, liquid, alcohol odour |pH indicator |1 |Not Tested | |HCl (0.5 mol/L) Reactant |Clear, liquid, sour odour |Acid

Ionic |44 |Not tested | |H2O (water)
Product |Clear, liquid, odourless |Non-reactive

|Not measured |No | |NaCl (salt)
Product |White, powdery, crusty, grainy texture |Neither

Ionic |Not measured |Yes | |

In this lab, the neutralization of of an acid and a base was observed. 20 drops of sodium hydroxide were added to an evaporating dish, followed by a drop of phenolphthalein indicator. The solution turned pink when the indicator was included. Quantitative Neutralization was used by adding drops of hydrochloric acid one by one to a sodium hydroxide-phenolphthalein solution. After a certain number of drops were added, the change of pH was seen by the change of colour in the dish, from red to clear. When the test solution had turned clear, it was determined that the solution was neutralized. The solution was evaporated, and the product was a white, chalky substance. Water was added to it, and tested for conductivity.


The purpose of this lab was to determine what happens and how to detect when an acid and a base neutralize. The equation for this lab was HCl + NaOh --> H2O + NaCl. As acids and bases have the same strength, they created a double displacement reaction. When the phenolphthalein was added to the solution and the colour turned pink, you knew that the base had reacted (Acids and Bases). When the hydrochloric acid was added, neutralization occurred, and the acid turned the phenolphthalein colourless. After 44 drops, the solution was neutralized, as the acids and bases were equal in amount (7 on the pH scale, meaning the solution was water and salt). When the solution was put on the evaporator, the water evaporated, leaving the salt. Then distilled water was added to the sodium chloride and tested for conductivity. The solution did conduct electricity. Sodium chloride (NaCl) is an ionic compound, therefore it holds ions that conduct electricity. In this experiment, different groups used different droppers, so the amount dropped into the dish could have been different, therefore each group had a different quantity of drops used. Some groups had an unusually small number, which is confusing, as groups can misinterpret this and believe that they did the lab wrong. A way to make this lab more clear would be to do it together as a class, so everyone ends up with the same observations and has a better understanding of the lab.


It is important to understand the pH scale, as it is all around us in our world. In nature, and in our manmade products, such as dangerous liquids that we might use around the house everyday, like cleaning products. If you understand pH levels, you understand what products to stay away from, as well as receive an understanding of our environment and what it requires to sustain its needs. This lab showed us how to detect a neutralization on the pH scale, and what happens when this occurs.

Cite This Document

Related Documents

  • Lab Report Acid Base Titration

    ...Title: ACID BASE TITRATION. Objectives: 1. To determine the concentration of acid using titration. 2. Skills of titration techniques. Apparatus: 1. 250 volumetric flask 2. 10mL measuring cylinder 3. 25mL pipette 4. 50mL burette 5. 250mL beaker 6. 150mL conical flask 7. Retord stand 8. White tile ...

    Read More
  • Acid Base PH Lab

    ...Potato Solution and Commercial Buffer, when Hydrochloric acid (0.1 mol/L) and Sodium Hydroxide (0.1 mol/L) is added Mahima Mandava Mrs. Haist September 23rd, 2014 SBI4U1 Background Information: The pH is the measurement of how acidic or how basic a substance can be. The pH scale is used to measure how acidic or basic a living cell...

    Read More
  • Acid-Base Lab

    ...Title: Acid-Base Titrations AP Chemistry Laboratory #6 II.Purpose: The purpose of this experiment is to standardize a sodium hydroxide solution and use the standard solution to titrate an unknown solid acid. The equivalent mass of the solid acid will be determined from the volume of sodium hydroxide added at the equivalence point. The equilibri...

    Read More
  • Lab - Acid-Base Titration

    ...Lab Report # 11 By: Andrew Hoitt CHEM 105 Lab 11/29/2012 Lab # 11 – Acid - Base Titration Introduction: The purpose of this lab is to determine the molarity (M) of an unknown HCl solution. A NaOH solution will be made and its molarity calculated. A sample of the NaOH solution will be titrated against the u...

    Read More
  • Acids and Bases Lap Report

    ...Acids and Bases Mirza Hasan Mammadov Acids and bases are really important in our daily day life. So let’s start with telling the definitions of them. Starting with acids, they are a substance which dissociates in water in order to produce one or more hydrogen ions. Also we can write H+ instead of hydrogen ion. Bases have the same definit...

    Read More
  • Lab Report Acid Base Titration

    ...EXPERIMENT 3: INTRODUCTION TO TITRATION – DETERMINATION OF THE MOLARITY AND CONCENTRATION OF SULPHURIC ACID BY TITRATION WITH A STANDARD SOLUTION OF SODIUM HYDROXIDE INTRODUCTION Reaction of acid and base is one of the most common reaction in chemistry. This reaction is also widely known as neutralization. In this experiment, we used titra...

    Read More
  • Acid Base Titration Lab

    ... Acid/ Base Titration Lab Design III Materials: Goggles HCl NaOH Distilled Water Label Beaker Graduated Cylinder Pipet Stirring rod Buret with clamp Stopper Ring Stand Utility Clamp Computer Computer Program pH probe Procedure: 1) 2) Goggles were put on. 3) 0.1 M NaOH solution was made using 0.4 g NaO...

    Read More
  • Lab Report on Acid-Base Titration

    ...1. Aim: To determine the weight-to-volume percent of acetic acid present in commercial vinegar and the weight-to-volume percent of ammonia present in window cleaners. Acid-base titrations can be conducted using the above samples against standardized aqueous NaOH and standardized aqueous HCl solutions respectively. 2. Introduction: Acetic acid...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.