On the use of dimensionless parameters in acid-base theory VII. The pH of solutions of salts of a strong acid and a weak base orvice versa

1994 ◽  
Vol 15 (1) ◽  
pp. 932-935 ◽  
Author(s):  
Harry Rilbe
Keyword(s):  
Strong Acid ◽  
Weak Base ◽  
Acid Base ◽  
Dimensionless Parameters ◽  
Base Theory

scholarly journals Utilization of Extract of Sambang Getih Leaves (Hemigraphis colorata. Hall. F) as a Acid-Base Indicator

2020 ◽  
Vol 9 (1) ◽  
pp. 7-15
Author(s):  
Eksari Ekasari ◽  
Purnama Ningsih
Keyword(s):  
Leaf Extract ◽  
Strong Acid ◽  
Weak Base ◽  
Acid Base ◽  
Strong Base ◽  
Unique Color ◽  
Acid Base Titration ◽  
Naoh Solution ◽  
Ph Range ◽  
Color Pigment

Getih sambang leaves (Hemigraphis Colorata. Hall. F) are plants that have a distinctive and unique color, namely the upper surface of the leaf is green and the bottom of the leaf is burgundy where sambang leaves contain anthocyanin compounds. Anthocyanin is the color pigment in plants that forms the basis of the use of natural indicators. This study aims to prove whether getih cucumber leaves can be used as an acid-base indicator, to determine the type of acid-base titration that is suitable for indicators of getih cucumber leaves, and to find out what the pH-changing color route of getih cucumber leaves is. The method used is extraction, namely maceration. Wee leaves are macerated by using methanol as a solvent for 24 hours. The extract was previously tested using HCl solution and NaOH solution as a test to prove the presence of anthocyanin. The results obtained in this study, getih sambang leaf extract can be used as an indicator of acid base, and also the type of acid-base titration that is suitable for use in the indicator of getih leaf extract extract precisely on the titration of strong-base strong acid, and strong weak base-acid It is best used as a substitute for the phenolphthalein indicator. In titration of strong and weak acids and bases, it is good to be used as a substitute for the indicator of methyl orange. The pH range obtained from the getih sambang leaf extract is pH 4-7 (red-purple).

scholarly journals Indikator Asam-Basa dari Bunga Dadap Merah (Erythrina crista-galliL.)

2017 ◽  
Vol 5 (1) ◽  
pp. 29
Author(s):  
Rahmawati Rahmawati ◽  
Siti Nuryanti ◽  
Ratman Ratman
Keyword(s):  
Colour Change ◽  
Strong Acid ◽  
Weak Acid ◽  
Weak Base ◽  
Acid Base ◽  
Buffer Solution ◽  
Strong Base ◽  
Flower Extract ◽  
Red Color ◽  
Dark Green

Dadap red (erythrina crista-galli L.) is belonged to the legumes (fabaceaea) family which, is one of the flowering shade plants that often used as an ornamental plant. This plant has a bright red flower, a taproot with root nodule bacteria nitrogen fixation and compound leaf consists three strands on each stem. This research is climed to proves that the extract of dadap red flower can be used as acid-base indicators. Dadap red flowers was macerated using methanol then filtered. The filtrate was ready to use as an acid-base indicator. The extract is tested in an acid-base, buffer solutions, and was compared with phenolphthalein for a strong acid with a strong base while a methyl orange a weak base with a strong acid. Based on the result, indicator of dadap red flower extrat in the strong acid was red colour, while in the weak acid was pink, and also in the strong base was dark green and in the weak base was purple. Furthermore, in the buffer solution, the indicator of dadap red flower extract gave four groups of colour change, namely red color at pH 1 to pH 6, colorless at pH 7 to pH 9, brown at pH 10 and blue at pH 11 to pH 12. Additionally, to attain the end point of titration, the indicators of dadap red flower extract gives a similar results with the comparison indicators. The results showed that the indicator of dadap red flower extracts can be used as an alternative indicator.

ETHANOLIC EXTRACT OF ARISTOLOCHIA BRACTEOLATA FLOWER AS A NATURAL INDICATOR FOR ACID-BASE TITRATION

INDIAN DRUGS ◽  
2019 ◽  
Vol 56 (03) ◽  
pp. 77-79
Author(s):  
G Vambhurkar ◽  
A. Jagtap ◽  
A. Gavade ◽  
M Kengar ◽  
M Bhutkar ◽  
...  
Keyword(s):  
Ethanolic Extract ◽  
Strong Acid ◽  
Weak Acid ◽  
Weak Base ◽  
Acid Base ◽  
Ph Indicator ◽  
Strong Base ◽  
Color Changes ◽  
Synthetic Indicators ◽  
Acid Base Titration

In acid-base titration or acid-base neutralization reaction the change in color due to change pH of the solution is caused due to a third substance which is termed as acid-base indicator or pH indicator. Every indicator shows different range of colors at different pH ranges. Synthetic indicators have been widely employed as indicators in acid-base titrations; however, due to environmental pollution, availability and cost, natural compounds are best alternates. Natural pigments in plants are highly colored substances and may show sharp color changes with variation in pH. In the present study an attempt has been made to extract natural indicator from flower of Aristolochia bracteolate. The equivalence points of the titrations namely strong acid-strong base, strong acid-weak base, weak acid-strong base and weak acid weak base titrations, using flower extract of A. bracteolate were coincident with the equivalence points obtained by the synthetic indicator phenolpthalein. From the results of the study, it may be concluded that ethanolic extract of A. bracteolate flower as an indicator for acid-base titration could be effectively employed as a substitute to the synthetic acid-base indicators.

scholarly journals Extraction of Green Acid-Base Indicators From Acanthus Pubescens Flower for Use in the School Laboratory

2020 ◽  
Vol 12 (2) ◽  
pp. 35
Author(s):  
Sintayehu Leshe ◽  
Habitamu Baye
Keyword(s):  
Strong Acid ◽  
Bromothymol Blue ◽  
Weak Acid ◽  
Methyl Red ◽  
Weak Base ◽  
Acid Base ◽  
Strong Base ◽  
Acid Versus ◽  
Ethanol Extracts ◽  
Accuracy Of Results

The use of Acanthus pubescens flower extracts as natural eco-friendly substitutes for synthetic acid - base indicators is experimentally confirmed. In this study, it is indicated that ethanolic and acidified ethanol extracts of Acanthus pubescens flower are good replacements to phenolphthalein, bromothymol blue and methyl red in acid-base titrations involving a strong acid versus strong base and a strong acid versus weak base. They can also be used as effective substitutes to phenolphthalein in a weak acid versus strong base titrations. And also the acidified ethanol extracts can be used in place of phenolphthalein and bromothymol blue while the ethanol extracts can replace methyl red in weak acid versus weak base titrations. It is also concluded that the use of Acanthus pubescens flower extract as an indicator in all types of acid base titrations is beneficial because of its economy, eco-friendly nature, ease of preparation, availability, simplicity, non-carcinogenicity, precision and accuracy of results.

scholarly journals GREEN CHEMISTRY: ROSELLE’S COROLLA EXTRACT AS A SUBSTITUTE FOR HAZARDOUS INTERNAL INDICATORS IN VOLUMETRIC ANALYSIS

2019 ◽  
Vol 7 (9) ◽  
pp. 118-122
Author(s):  
R. F. Pagariya
Keyword(s):  
Strong Acid ◽  
Weak Acid ◽  
Basic Solution ◽  
Phenol Red ◽  
Weak Base ◽  
Acid Base ◽  
Ph Indicator ◽  
Strong Base ◽  
Synthetic Indicators ◽  
Acid Base Titration

Indicators used in acid-base titration show well marked changes of colour in certain intervals of pH. Most of these indicators are organic dyes and are of synthetic origin. Today synthetic indicators are the choice of neutralization titrations. But due to environmental pollution, availability and cost, the search for natural compounds as an acid-base indicator was started. The present work highlights the use of the ethanolic extract of the corolla of Roselle (Hibiscus sabdariffa) as a pH indicator in strong acid-strong base, strong acid weak base, weak acid strong base and weak acid-weak base titrations. This natural indicator is easy to extract as well as easily available. The results showed that the Roselle’s corolla indicator gave red color in acidic solution, while green in basic solution. The comparison indicators used in this research were phenolphthalein, methyl red and phenol red. Hopeful results were obtained when it was compared against standard synthetic indicators. The equivalence points obtained match with the equivalence points obtained by standard indicators. Therefore this natural indicator is found to be useful, economical, simple, precise and eco-friendly for acid base titration.

scholarly journals GREEN CHEMISTRY: STUDY OF ACID-BASE INDICATOR PROPERTY OF GOLDEN BEET ROOT

2015 ◽  
Vol 3 (9SE) ◽  
pp. 1-6
Author(s):  
Prashant Thote
Keyword(s):  
Strong Acid ◽  
Weak Acid ◽  
Hot Water ◽  
Root Extract ◽  
Weak Base ◽  
Acid Base ◽  
Strong Base ◽  
Beet Root ◽  
Color Changes ◽  
Synthetic Indicators

In acid- base titrations, indicators are used to show a sharp color changes at interval of pH.Natural pigments in plants are highly colored substances and may show color changes withvariation of pH. An attempt has been made to investigate the indicator activity of root extract of golden beet root and to replace the synthetic indicators as they have certain disadvantages like chemical pollution, availability problems and high cost.   A study has been done to investigate the indicator activity of aqueous extract of root pigments and compared with that of already existing synthetic indicators. Pigments were extracted using hot water and a definite volume was added which gave accurate and reliable results for all the four different types of neutralization titrations - strong acid against strong base, strong acid against a weak base, weak acid against strong base and weak acid against weak base. The work proved to be acceptable in introducing root pigments as a substitute to the synthetic acid-base indicators.

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