pH, Turbidity and TDS Measure Different Properties
Duration: 5 min
This video lesson is available to enrolled students.
Inside: a video lesson and guided study material.
Module outline
- General Intelligence & Reasoning: Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Blood Relations, Data Sufficiency, Number System, HCF LCM, Selection Decision Table (Decision Making), Logical Sequence Of Words, Directions (Direction Test), Ranking, Order and Sequence, Syllogisms, Venn Diagram, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Puzzle Solving (Puzzles), Data Arrangement, Analytical Reasoning (Counting Figures Reasoning), Cubes & Dices, Calendar, Clock, Arithmetic, Verbal Analogy (Word Based Analogy), Numerical Reasoning, Patterns in Two-Dimensional Figures, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Coding and Decoding, Cubes and Dice, Series Completion, Alphabet and Word Tests, Analogy and Classification, Vocabulary, Mathematical Operations, Direction Sense, Number System, Averages, Mixtures and Alligation, Percentages, Logical Deduction and Induction, Simplification and Approximation, Algebra, Sequences and Series, Powers, Surds and Logarithms, Constraint Puzzles, Critical Reasoning, Order, Ranking and Sequence, Syllogisms and Venn Diagrams, Reading Comprehension, Speed, Time and Distance, Traverse Surveying, Clocks and Calendars, Permutations and Combinations, Narrative Sequencing, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Ratio and Proportion, Time and Work, Mensuration, Data Interpretation, Articles and Determiners, Sentence Completion, Data Sufficiency, Blood Relations, Simple Interest and Compound Interest, Mixture and Alligation, Sequence and Series (Series), Speed Time and Distance, Algebra, Profit and Loss, Seating Arrangements, Permutation and Combination, Combinatorics
- General Awareness: Physics, Chemistry, Biology, History, Geography, Polity, Indian Economy, Environment, Static General Knowledge, GK- Current Affairs
- Full-Length Mock Tests:
- Sectional Tests:
AI summary & chapters
AI Summary
An AI-generated summary of this video lecture.
The lecture explains that pH, turbidity, and total dissolved solids (TDS) are separate drinking-water indicators, each measuring a different property. The first slide presents a three-row table: pH indicates acidity or alkalinity; turbidity indicates cloudiness caused by particles that scatter light; and TDS indicates the amount of dissolved substances, including salts. The instructor emphasizes that suspended mud and dissolved salts are different, and that low TDS does not mean the water is free from germs. A water-drop diagram with a pH gauge, a brown muddy drop, and particle insets supports the distinction. Red annotations circle the muddy drop, underline each parameter, circle “scatter light” and “Amount of dissolved substances, including salts,” and add a “PM2.5 - PM10” note linked to turbidity/TDS, suggesting a comparison with airborne particulate matter. The second slide, “Three Important Drinking-water Limits,” references IS 10500:2012 and BIS/IS standards. It gives acceptable and permissible limits: pH 6.5–8.5 with no relaxation; TDS 500 mg/L acceptable, 2,000 mg/L permissible if no alternate source exists; turbidity 1 NTU acceptable, 5 NTU permissible. NTU is defined as Nephelometric Turbidity Unit. The instructor circles the standard labels and each limit value, and notes that the higher permissible limit is not the preferred target.
Chapters
0:00 – 2:00 00:00-02:00
The slide “pH, Turbidity and TDS Measure Different Properties” (Hindi: “pH, मटैलापन और TDS अलग गुण बताते है”) shows a table: pH = “Acidity or alkalinity”; Turbidity = “Cloudiness caused by particles that scatter light”; TDS = “Amount of dissolved substances, including salts.” Bullets state “Suspended mud and dissolved salts are different” and “Low TDS does not mean ‘free from germs’.” A top-right diagram shows three water drops (pH gauge, brown muddy drop, particles) linked to a glass of water. Red annotations appear: a circle around the muddy drop, underlines beneath each parameter, a circle around “scatter light,” and a “PM2.5 - PM10” label with an arrow toward the Turbidity/TDS rows, linking turbidity to particulate matter.
2:00 – 4:35 02:00-04:35
The slide switches to “Three Important Drinking-water Limits” (Hindi: “पेयजल की तीन महत्वपूर्ण सीमाएँ”), referencing IS 10500:2012. A table lists Parameter, Acceptable limit, and Permissible if no alternate source exists: pH 6.5–8.5 / No relaxation; TDS 500 mg/L / 2,000 mg/L; Turbidity 1 NTU / 5 NTU. “NTU means Nephelometric Turbidity Unit” is shown. Red circles highlight “BIS” and “IS” in the standards text, then progressively circle each limit value (6.5–8.5, 500 mg/L, 1 NTU, 2,000 mg/L, 5 NTU). A red arrow and scribble mark the 2,000 mg/L cell, and the note “The higher permissible limit is not the preferred target” appears, clarifying that permissible limits are fallbacks, not goals.
The lesson distinguishes three independent water-quality parameters and then gives their regulatory limits. pH measures acidity/alkalinity, turbidity measures light-scattering cloudiness from suspended particles, and TDS measures dissolved substances like salts; these are not interchangeable, and low TDS does not imply microbiological safety. The PM2.5–PM10 annotation draws an analogy between turbidity and airborne particulates. The limits slide (IS 10500:2012) provides exam-relevant values: pH 6.5–8.5 (no relaxation), TDS 500 mg/L acceptable / 2,000 mg/L permissible, turbidity 1 NTU acceptable / 5 NTU permissible, with NTU defined as Nephelometric Turbidity Unit. The key takeaway is that permissible limits apply only when no alternate source exists and are not the preferred target.